diff --git a/browser/base/content/browser-places.js b/browser/base/content/browser-places.js
index 54013d915ac8..a6b1d8363330 100644
--- a/browser/base/content/browser-places.js
+++ b/browser/base/content/browser-places.js
@@ -1379,44 +1379,37 @@ var BookmarkingUI = {
       aHeaderItem.nextSibling.remove();
     }
 
-    PlacesUtils.history.QueryInterface(Ci.nsPIPlacesDatabase)
-                       .asyncExecuteLegacyQueries([query], 1, options, {
-      handleResult: function (aResultSet) {
-        let onItemCommand = function (aEvent) {
-          let item = aEvent.target;
-          openUILink(item.getAttribute("targetURI"), aEvent);
-          CustomizableUI.hidePanelForNode(item);
-        };
+    let onItemCommand = function (aEvent) {
+      let item = aEvent.target;
+      openUILink(item.getAttribute("targetURI"), aEvent);
+      CustomizableUI.hidePanelForNode(item);
+    };
 
-        let fragment = document.createDocumentFragment();
-        let row;
-        while ((row = aResultSet.getNextRow())) {
-          let uri = row.getResultByIndex(1);
-          let title = row.getResultByIndex(2);
-          let icon = row.getResultByIndex(6);
+    let fragment = document.createDocumentFragment();
+    let root = PlacesUtils.history.executeQuery(query, options).root;
+    root.containerOpen = true;
+    for (let i = 0; i < root.childCount; i++) {
+      let node = root.getChild(i);
+      let uri = node.uri;
+      let title = node.title;
+      let icon = node.icon;
 
-          let item =
-            document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul",
-                                     "menuitem");
-          item.setAttribute("label", title || uri);
-          item.setAttribute("targetURI", uri);
-          item.setAttribute("class", "menuitem-iconic menuitem-with-favicon bookmark-item " +
-                                     extraCSSClass);
-          item.addEventListener("command", onItemCommand);
-          if (icon) {
-            let iconURL = "moz-anno:favicon:" + icon;
-            item.setAttribute("image", iconURL);
-          }
-          fragment.appendChild(item);
-        }
-        aHeaderItem.parentNode.insertBefore(fragment, aHeaderItem.nextSibling);
-      },
-      handleError: function (aError) {
-        Cu.reportError("Error while attempting to show recent bookmarks: " + aError);
-      },
-      handleCompletion: function (aReason) {
-      },
-    });
+      let item =
+        document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul",
+                                 "menuitem");
+      item.setAttribute("label", title || uri);
+      item.setAttribute("targetURI", uri);
+      item.setAttribute("class", "menuitem-iconic menuitem-with-favicon bookmark-item " +
+                                 extraCSSClass);
+      item.addEventListener("command", onItemCommand);
+      if (icon) {
+        let iconURL = "moz-anno:favicon:" + icon;
+        item.setAttribute("image", iconURL);
+      }
+      fragment.appendChild(item);
+    }
+    root.containerOpen = false;
+    aHeaderItem.parentNode.insertBefore(fragment, aHeaderItem.nextSibling);
   },
 
   /**
diff --git a/browser/base/content/contentSearchUI.js b/browser/base/content/contentSearchUI.js
index 92611cd4c38c..34f4f2efc28d 100644
--- a/browser/base/content/contentSearchUI.js
+++ b/browser/base/content/contentSearchUI.js
@@ -252,7 +252,8 @@ ContentSearchUIController.prototype = {
     let searchText = this.input;
     let searchTerms;
     if (this._table.hidden ||
-        aEvent.originalTarget.id == "contentSearchDefaultEngineHeader") {
+        aEvent.originalTarget.id == "contentSearchDefaultEngineHeader" ||
+        aEvent instanceof KeyboardEvent) {
       searchTerms = searchText.value;
     }
     else {
diff --git a/browser/base/content/test/general/browser.ini b/browser/base/content/test/general/browser.ini
index 585b732a4f3e..dcfac57841ff 100644
--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -290,7 +290,6 @@ skip-if = os == 'win' || e10s # Bug 1159268 - Need a content-process safe versio
 [browser_bug1070778.js]
 [browser_accesskeys.js]
 [browser_canonizeURL.js]
-skip-if = e10s # Bug 1094510 - test hits the network in e10s mode only
 [browser_clipboard.js]
 [browser_contentAreaClick.js]
 [browser_contextmenu.js]
diff --git a/browser/base/content/test/general/browser_canonizeURL.js b/browser/base/content/test/general/browser_canonizeURL.js
index 48fd814440fe..2b0fc22e7eba 100644
--- a/browser/base/content/test/general/browser_canonizeURL.js
+++ b/browser/base/content/test/general/browser_canonizeURL.js
@@ -1,8 +1,3 @@
-function test() {
-  waitForExplicitFinish();
-  testNext();
-}
-
 var pairs = [
   ["example", "http://www.example.net/"],
   ["ex-ample", "http://www.ex-ample.net/"],
@@ -20,37 +15,56 @@ var pairs = [
   ["ex ample", Services.search.defaultEngine.getSubmission("ex ample", null, "keyword").uri.spec],
 ];
 
-function testNext() {
-  if (!pairs.length) {
-    finish();
-    return;
-  }
+add_task(function*() {
+  for (let [inputValue, expectedURL] of pairs) {
+    let focusEventPromise = BrowserTestUtils.waitForEvent(gURLBar, "focus");
+    let messagePromise = BrowserTestUtils.waitForMessage(gBrowser.selectedBrowser.messageManager,
+                                                         "browser_canonizeURL:start");
 
-  let [inputValue, expectedURL] = pairs.shift();
+    let stoppedLoadPromise = ContentTask.spawn(gBrowser.selectedBrowser, [inputValue, expectedURL],
+      function([inputValue, expectedURL]) {
+        return new Promise(resolve => {
+          let wpl = {
+            onStateChange(aWebProgress, aRequest, aStateFlags, aStatus) {
+              if (aStateFlags & Ci.nsIWebProgressListener.STATE_START &&
+                  aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK) {
+                if (!aRequest || !(aRequest instanceof Ci.nsIChannel)) {
+                  return;
+                }
+                aRequest.QueryInterface(Ci.nsIChannel);
+                is(aRequest.originalURI.spec, expectedURL,
+                   "entering '" + inputValue + "' loads expected URL");
 
-  gBrowser.addProgressListener({
-    onStateChange: function onStateChange(aWebProgress, aRequest, aStateFlags, aStatus) {
-      if (aStateFlags & Ci.nsIWebProgressListener.STATE_START &&
-          aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK) {
-        is(aRequest.originalURI.spec, expectedURL,
-           "entering '" + inputValue + "' loads expected URL");
+                webProgress.removeProgressListener(filter);
+                filter.removeProgressListener(wpl);
+                docShell.QueryInterface(Ci.nsIWebNavigation);
+                docShell.stop(docShell.STOP_ALL);
+                resolve();
+              }
+            },
+          };
+          let filter = Cc["@mozilla.org/appshell/component/browser-status-filter;1"]
+                           .createInstance(Ci.nsIWebProgress);
+          filter.addProgressListener(wpl, Ci.nsIWebProgress.NOTIFY_ALL);
 
-        gBrowser.removeProgressListener(this);
-        gBrowser.stop();
-
-        executeSoon(testNext);
+          let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor)
+                                    .getInterface(Ci.nsIWebProgress);
+          webProgress.addProgressListener(filter, Ci.nsIWebProgress.NOTIFY_ALL);
+          // We're sending this off to trigger the start of the this test, when all the
+          // listeners are in place:
+          sendAsyncMessage("browser_canonizeURL:start");
+        });
       }
-    }
-  });
+    );
+
+    gBrowser.selectedBrowser.focus();
+    gURLBar.focus();
+
+    yield Promise.all([focusEventPromise, messagePromise]);
 
-  gURLBar.addEventListener("focus", function onFocus() {
-    gURLBar.removeEventListener("focus", onFocus);
     gURLBar.inputField.value = inputValue.slice(0, -1);
     EventUtils.synthesizeKey(inputValue.slice(-1) , {});
     EventUtils.synthesizeKey("VK_RETURN", { shiftKey: true });
-  });
-
-  gBrowser.selectedBrowser.focus();
-  gURLBar.focus();
-
-}
+    yield stoppedLoadPromise;
+  }
+});
diff --git a/browser/components/controlcenter/content/panel.inc.xul b/browser/components/controlcenter/content/panel.inc.xul
index d02efd69d95a..537c77f56c2d 100644
--- a/browser/components/controlcenter/content/panel.inc.xul
+++ b/browser/components/controlcenter/content/panel.inc.xul
@@ -105,7 +105,7 @@
                      when-connection="secure secure-ev"/>
       </vbox>
 
-      <vbox id="identity-popup-securityView-body">
+      <vbox id="identity-popup-securityView-body" flex="1">
         <!-- (EV) Certificate Information -->
         <description id="identity-popup-content-verified-by"
                      when-connection="secure-ev">&identity.connectionVerified1;</description>
@@ -168,7 +168,9 @@
                 label="&identity.enableMixedContentBlocking.label;"
                 accesskey="&identity.enableMixedContentBlocking.accesskey;"
                 oncommand="gIdentityHandler.enableMixedContentProtection()"/>
+      </vbox>
 
+      <vbox id="identity-popup-securityView-footer">
         <!-- More Security Information -->
         <button label="&identity.moreInfoLinkText2;"
                 oncommand="gIdentityHandler.handleMoreInfoClick(event);"/>
diff --git a/browser/components/distribution.js b/browser/components/distribution.js
index 19f278f4208c..49f100efafb8 100644
--- a/browser/components/distribution.js
+++ b/browser/components/distribution.js
@@ -346,11 +346,47 @@ DistributionCustomizer.prototype = {
       Cu.reportError(e);
     }
 
+    var usedPreferences = [];
+
+    if (sections["Preferences-" + this._locale]) {
+      for (let key of enumerate(this._ini.getKeys("Preferences-" + this._locale))) {
+        try {
+          let value = this._ini.getString("Preferences-" + this._locale, key);
+          if (value) {
+            Preferences.set(key, parseValue(value));
+          }
+          usedPreferences.push(key);
+        } catch (e) { /* ignore bad prefs and move on */ }
+      }
+    }
+
+    if (sections["Preferences-" + this._language]) {
+      for (let key of enumerate(this._ini.getKeys("Preferences-" + this._language))) {
+        if (usedPreferences.indexOf(key) > -1) {
+          continue;
+        }
+        try {
+          let value = this._ini.getString("Preferences-" + this._language, key);
+          if (value) {
+            Preferences.set(key, parseValue(value));
+          }
+          usedPreferences.push(key);
+        } catch (e) { /* ignore bad prefs and move on */ }
+      }
+    }
+
     if (sections["Preferences"]) {
       for (let key of enumerate(this._ini.getKeys("Preferences"))) {
+        if (usedPreferences.indexOf(key) > -1) {
+          continue;
+        }
         try {
-          let value = parseValue(this._ini.getString("Preferences", key));
-          Preferences.set(key, value);
+          let value = this._ini.getString("Preferences", key);
+          if (value) {
+            value = value.replace(/%LOCALE%/g, this._locale);
+            value = value.replace(/%LANGUAGE%/g, this._language);
+            Preferences.set(key, parseValue(value));
+          }
         } catch (e) { /* ignore bad prefs and move on */ }
       }
     }
@@ -363,8 +399,9 @@ DistributionCustomizer.prototype = {
     if (sections["LocalizablePreferences-" + this._locale]) {
       for (let key of enumerate(this._ini.getKeys("LocalizablePreferences-" + this._locale))) {
         try {
-          let value = parseValue(this._ini.getString("LocalizablePreferences-" + this._locale, key));
-          if (value !== undefined) {
+          let value = this._ini.getString("LocalizablePreferences-" + this._locale, key);
+          if (value) {
+            value = parseValue(value);
             localizedStr.data = "data:text/plain," + key + "=" + value;
             defaults._prefBranch.setComplexValue(key, Ci.nsIPrefLocalizedString, localizedStr);
           }
@@ -379,8 +416,9 @@ DistributionCustomizer.prototype = {
           continue;
         }
         try {
-          let value = parseValue(this._ini.getString("LocalizablePreferences-" + this._language, key));
-          if (value !== undefined) {
+          let value = this._ini.getString("LocalizablePreferences-" + this._language, key);
+          if (value) {
+            value = parseValue(value);
             localizedStr.data = "data:text/plain," + key + "=" + value;
             defaults._prefBranch.setComplexValue(key, Ci.nsIPrefLocalizedString, localizedStr);
           }
@@ -395,13 +433,14 @@ DistributionCustomizer.prototype = {
           continue;
         }
         try {
-          let value = parseValue(this._ini.getString("LocalizablePreferences", key));
-          if (value !== undefined) {
+          let value = this._ini.getString("LocalizablePreferences", key);
+          if (value) {
+            value = parseValue(value);
             value = value.replace(/%LOCALE%/g, this._locale);
             value = value.replace(/%LANGUAGE%/g, this._language);
             localizedStr.data = "data:text/plain," + key + "=" + value;
-            defaults._prefBranch.setComplexValue(key, Ci.nsIPrefLocalizedString, localizedStr);
           }
+          defaults._prefBranch.setComplexValue(key, Ci.nsIPrefLocalizedString, localizedStr);
         } catch (e) { /* ignore bad prefs and move on */ }
       }
     }
diff --git a/browser/components/extensions/ext-utils.js b/browser/components/extensions/ext-utils.js
index 480054e1325d..54aacc39b3aa 100644
--- a/browser/components/extensions/ext-utils.js
+++ b/browser/components/extensions/ext-utils.js
@@ -125,6 +125,19 @@ global.makeWidgetId = id => {
   return id.replace(/[^a-z0-9_-]/g, "_");
 };
 
+function promisePopupShown(popup) {
+  return new Promise(resolve => {
+    if (popup.state == "open") {
+      resolve();
+    } else {
+      popup.addEventListener("popupshown", function onPopupShown(event) {
+        popup.removeEventListener("popupshown", onPopupShown);
+        resolve();
+      });
+    }
+  });
+}
+
 class BasePopup {
   constructor(extension, viewNode, popupURL) {
     let popupURI = Services.io.newURI(popupURL, null, extension.baseURI);
@@ -254,6 +267,10 @@ class BasePopup {
 
   // Resizes the browser to match the preferred size of the content.
   resizeBrowser() {
+    if (!this.browser) {
+      return;
+    }
+
     let width, height;
     try {
       let w = {}, h = {};
@@ -310,7 +327,12 @@ global.PanelPopup = class PanelPopup extends BasePopup {
   }
 
   closePopup() {
-    this.viewNode.hidePopup();
+    promisePopupShown(this.viewNode).then(() => {
+      // Make sure we're not already destroyed.
+      if (this.viewNode) {
+        this.viewNode.hidePopup();
+      }
+    });
   }
 };
 
diff --git a/browser/components/extensions/test/browser/browser_ext_browserAction_popup.js b/browser/components/extensions/test/browser/browser_ext_browserAction_popup.js
index a4f5fb8afb52..e2f1a8d7faa1 100644
--- a/browser/components/extensions/test/browser/browser_ext_browserAction_popup.js
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_popup.js
@@ -3,6 +3,8 @@
 "use strict";
 
 function* testInArea(area) {
+  let scriptPage = url => `<html><head><meta charset="utf-8"><script src="${url}"></script></head></html>`;
+
   let extension = ExtensionTestUtils.loadExtension({
     manifest: {
       "background": {
@@ -14,17 +16,22 @@ function* testInArea(area) {
     },
 
     files: {
-      "popup-a.html": `<script src="popup-a.js"></script>`,
+      "popup-a.html": scriptPage("popup-a.js"),
       "popup-a.js": function() {
         browser.runtime.sendMessage("from-popup-a");
+        browser.runtime.onMessage.addListener(msg => {
+          if (msg == "close-popup") {
+            window.close();
+          }
+        });
       },
 
-      "data/popup-b.html": `<script src="popup-b.js"></script>`,
+      "data/popup-b.html": scriptPage("popup-b.js"),
       "data/popup-b.js": function() {
         browser.runtime.sendMessage("from-popup-b");
       },
 
-      "data/background.html": `<script src="background.js"></script>`,
+      "data/background.html": scriptPage("background.js"),
 
       "data/background.js": function() {
         let sendClick;
@@ -51,26 +58,36 @@ function* testInArea(area) {
           },
           () => {
             browser.browserAction.setPopup({popup: "/popup-a.html"});
-            sendClick({expectEvent: false, expectPopup: "a"});
+            sendClick({expectEvent: false, expectPopup: "a", runNextTest: true});
+          },
+          () => {
+            browser.test.sendMessage("next-test", {expectClosed: true});
           },
         ];
 
         let expect = {};
-        sendClick = ({expectEvent, expectPopup}) => {
-          expect = {event: expectEvent, popup: expectPopup};
+        sendClick = ({expectEvent, expectPopup, runNextTest}) => {
+          expect = {event: expectEvent, popup: expectPopup, runNextTest};
           browser.test.sendMessage("send-click");
         };
 
         browser.runtime.onMessage.addListener(msg => {
-          if (expect.popup) {
+          if (msg == "close-popup") {
+            return;
+          } else if (expect.popup) {
             browser.test.assertEq(msg, `from-popup-${expect.popup}`,
                                   "expected popup opened");
           } else {
-            browser.test.fail("unexpected popup");
+            browser.test.fail(`unexpected popup: ${msg}`);
           }
 
           expect.popup = null;
-          browser.test.sendMessage("next-test");
+          if (expect.runNextTest) {
+            expect.runNextTest = false;
+            tests.shift()();
+          } else {
+            browser.test.sendMessage("next-test");
+          }
         });
 
         browser.browserAction.onClicked.addListener(() => {
@@ -85,6 +102,11 @@ function* testInArea(area) {
         });
 
         browser.test.onMessage.addListener((msg) => {
+          if (msg == "close-popup") {
+            browser.runtime.sendMessage("close-popup");
+            return;
+          }
+
           if (msg != "next-test") {
             browser.test.fail("Expecting 'next-test' message");
           }
@@ -107,13 +129,23 @@ function* testInArea(area) {
   });
 
   let widget;
-  extension.onMessage("next-test", Task.async(function* () {
+  extension.onMessage("next-test", Task.async(function* (expecting = {}) {
     if (!widget) {
       widget = getBrowserActionWidget(extension);
       CustomizableUI.addWidgetToArea(widget.id, area);
     }
+    if (expecting.expectClosed) {
+      let panel = getBrowserActionPopup(extension);
+      ok(panel, "Expect panel to exist");
+      yield promisePopupShown(panel);
 
-    yield closeBrowserAction(extension);
+      extension.sendMessage("close-popup");
+
+      yield promisePopupHidden(panel);
+      ok(true, "Panel is closed");
+    } else {
+      yield closeBrowserAction(extension);
+    }
 
     extension.sendMessage("next-test");
   }));
diff --git a/browser/components/extensions/test/browser/browser_ext_pageAction_popup.js b/browser/components/extensions/test/browser/browser_ext_pageAction_popup.js
index 488c96d1dc7a..a7a5047c45b0 100644
--- a/browser/components/extensions/test/browser/browser_ext_pageAction_popup.js
+++ b/browser/components/extensions/test/browser/browser_ext_pageAction_popup.js
@@ -19,6 +19,11 @@ add_task(function* testPageActionPopup() {
       "popup-a.html": scriptPage("popup-a.js"),
       "popup-a.js": function() {
         browser.runtime.sendMessage("from-popup-a");
+        browser.runtime.onMessage.addListener(msg => {
+          if (msg == "close-popup") {
+            window.close();
+          }
+        });
       },
 
       "data/popup-b.html": scriptPage("popup-b.js"),
@@ -55,26 +60,36 @@ add_task(function* testPageActionPopup() {
           },
           () => {
             browser.pageAction.setPopup({tabId, popup: "/popup-a.html"});
-            sendClick({expectEvent: false, expectPopup: "a"});
+            sendClick({expectEvent: false, expectPopup: "a", runNextTest: true});
+          },
+          () => {
+            browser.test.sendMessage("next-test", {expectClosed: true});
           },
         ];
 
         let expect = {};
-        sendClick = ({expectEvent, expectPopup}) => {
-          expect = {event: expectEvent, popup: expectPopup};
+        sendClick = ({expectEvent, expectPopup, runNextTest}) => {
+          expect = {event: expectEvent, popup: expectPopup, runNextTest};
           browser.test.sendMessage("send-click");
         };
 
         browser.runtime.onMessage.addListener(msg => {
-          if (expect.popup) {
+          if (msg == "close-popup") {
+            return;
+          } else if (expect.popup) {
             browser.test.assertEq(msg, `from-popup-${expect.popup}`,
                                   "expected popup opened");
           } else {
-            browser.test.fail("unexpected popup");
+            browser.test.fail(`unexpected popup: ${msg}`);
           }
 
           expect.popup = null;
-          browser.test.sendMessage("next-test");
+          if (expect.runNextTest) {
+            expect.runNextTest = false;
+            tests.shift()();
+          } else {
+            browser.test.sendMessage("next-test");
+          }
         });
 
         browser.pageAction.onClicked.addListener(() => {
@@ -89,6 +104,11 @@ add_task(function* testPageActionPopup() {
         });
 
         browser.test.onMessage.addListener((msg) => {
+          if (msg == "close-popup") {
+            browser.runtime.sendMessage("close-popup");
+            return;
+          }
+
           if (msg != "next-test") {
             browser.test.fail("Expecting 'next-test' message");
           }
@@ -118,12 +138,22 @@ add_task(function* testPageActionPopup() {
     clickPageAction(extension);
   });
 
-  extension.onMessage("next-test", Task.async(function* () {
+  extension.onMessage("next-test", Task.async(function* (expecting = {}) {
     let panel = document.getElementById(panelId);
-    if (panel) {
+    if (expecting.expectClosed) {
+      ok(panel, "Expect panel to exist");
+      yield promisePopupShown(panel);
+
+      extension.sendMessage("close-popup");
+
+      yield promisePopupHidden(panel);
+      ok(true, `Panel is closed`);
+    } else if (panel) {
       yield promisePopupShown(panel);
       panel.hidePopup();
+    }
 
+    if (panel) {
       panel = document.getElementById(panelId);
       is(panel, null, "panel successfully removed from document after hiding");
     }
diff --git a/browser/components/extensions/test/browser/browser_ext_webNavigation_getFrames.js b/browser/components/extensions/test/browser/browser_ext_webNavigation_getFrames.js
index 039a88650745..9bf366bd55d8 100644
--- a/browser/components/extensions/test/browser/browser_ext_webNavigation_getFrames.js
+++ b/browser/components/extensions/test/browser/browser_ext_webNavigation_getFrames.js
@@ -138,6 +138,9 @@ add_task(function* testWebNavigationFrames() {
   is(getAllFramesDetails.length, collectedDetails.length,
      "number of frames found should equal the number onCompleted events collected");
 
+  is(getAllFramesDetails[0].frameId, 0, "the root frame has the expected frameId");
+  is(getAllFramesDetails[0].parentFrameId, -1, "the root frame has the expected parentFrameId");
+
   // ordered by frameId
   let sortByFrameId = (el1, el2) => {
     let val1 = el1 ? el1.frameId : -1;
diff --git a/browser/components/extensions/test/browser/head.js b/browser/components/extensions/test/browser/head.js
index a43e1fcf6b00..232c188e336f 100644
--- a/browser/components/extensions/test/browser/head.js
+++ b/browser/components/extensions/test/browser/head.js
@@ -7,7 +7,7 @@
  *          clickBrowserAction clickPageAction
  *          getBrowserActionPopup getPageActionPopup
  *          closeBrowserAction closePageAction
- *          promisePopupShown
+ *          promisePopupShown promisePopupHidden
  */
 
 var {AppConstants} = Cu.import("resource://gre/modules/AppConstants.jsm");
@@ -59,6 +59,16 @@ function promisePopupShown(popup) {
   });
 }
 
+function promisePopupHidden(popup) {
+  return new Promise(resolve => {
+    let onPopupHidden = event => {
+      popup.removeEventListener("popuphidden", onPopupHidden);
+      resolve();
+    };
+    popup.addEventListener("popuphidden", onPopupHidden);
+  });
+}
+
 function getBrowserActionWidget(extension) {
   return CustomizableUI.getWidget(makeWidgetId(extension.id) + "-browser-action");
 }
@@ -68,6 +78,8 @@ function getBrowserActionPopup(extension, win = window) {
 
   if (group.areaType == CustomizableUI.TYPE_TOOLBAR) {
     return win.document.getElementById("customizationui-widget-panel");
+  } else {
+    return win.PanelUI.panel;
   }
   return null;
 }
diff --git a/browser/components/places/tests/browser/browser.ini b/browser/components/places/tests/browser/browser.ini
index 28614b5b02ac..6d638d64ec2d 100644
--- a/browser/components/places/tests/browser/browser.ini
+++ b/browser/components/places/tests/browser/browser.ini
@@ -46,7 +46,6 @@ skip-if = e10s # Bug ?????? - test fails - "Number of dragged items should be th
 [browser_library_search.js]
 [browser_library_views_liveupdate.js]
 [browser_markPageAsFollowedLink.js]
-skip-if = e10s # Bug 933103 - mochitest's EventUtils.synthesizeMouse functions not e10s friendly (test does EventUtils.sendMouseEvent...)
 [browser_sidebarpanels_click.js]
 skip-if = true # temporarily disabled for breaking the treeview - bug 658744
 [browser_sort_in_library.js]
diff --git a/browser/components/places/tests/browser/browser_markPageAsFollowedLink.js b/browser/components/places/tests/browser/browser_markPageAsFollowedLink.js
index e2a04f6017a1..e3557338a330 100644
--- a/browser/components/places/tests/browser/browser_markPageAsFollowedLink.js
+++ b/browser/components/places/tests/browser/browser_markPageAsFollowedLink.js
@@ -1,7 +1,3 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/
- */
-
 /**
  * Tests that visits across frames are correctly represented in the database.
  */
@@ -11,76 +7,61 @@ const PAGE_URL = BASE_URL + "/framedPage.html";
 const LEFT_URL = BASE_URL + "/frameLeft.html";
 const RIGHT_URL = BASE_URL + "/frameRight.html";
 
-var gTabLoaded = false;
-var gLeftFrameVisited = false;
+add_task(function* test() {
+  // We must wait for both frames to be loaded and the visits to be registered.
+  let deferredLeftFrameVisit = PromiseUtils.defer();
+  let deferredRightFrameVisit = PromiseUtils.defer();
 
-var observer = {
-  observe: function(aSubject, aTopic, aData)
-  {
-    let url = aSubject.QueryInterface(Ci.nsIURI).spec;
-    if (url == LEFT_URL ) {
-      is(getTransitionForUrl(url), null,
-         "Embed visits should not get a database entry.");
-      gLeftFrameVisited = true;
-      maybeClickLink();
-    }
-    else if (url == RIGHT_URL ) {
-      is(getTransitionForUrl(url), PlacesUtils.history.TRANSITION_FRAMED_LINK,
-         "User activated visits should get a FRAMED_LINK transition.");
-      finish();
-    }
-  },
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver])
-};
-Services.obs.addObserver(observer, "uri-visit-saved", false);
+  Services.obs.addObserver(function observe(subject) {
+    Task.spawn(function* () {
+      let url = subject.QueryInterface(Ci.nsIURI).spec;
+      if (url == LEFT_URL ) {
+        is((yield getTransitionForUrl(url)), null,
+           "Embed visits should not get a database entry.");
+        deferredLeftFrameVisit.resolve();
+      }
+      else if (url == RIGHT_URL ) {
+        is((yield getTransitionForUrl(url)),
+           PlacesUtils.history.TRANSITION_FRAMED_LINK,
+           "User activated visits should get a FRAMED_LINK transition.");
+        Services.obs.removeObserver(observe, "uri-visit-saved");
+        deferredRightFrameVisit.resolve();
+      }
+    });
+  }, "uri-visit-saved", false);
 
-function test()
-{
-  waitForExplicitFinish();
-  gBrowser.selectedTab = gBrowser.addTab(PAGE_URL);
-  let frameCount = 0;
-  gBrowser.selectedBrowser.addEventListener("DOMContentLoaded",
-    function (event)
-    {
-      // Wait for all the frames.
-      if (frameCount++ < 2)
-        return;
-      gBrowser.selectedBrowser.removeEventListener("DOMContentLoaded", arguments.callee, false)
-      gTabLoaded = true;
-      maybeClickLink();
-    }, false
-  );
-}
+  // Open a tab and wait for all the subframes to load.
+  let tab = yield BrowserTestUtils.openNewForegroundTab(gBrowser, PAGE_URL);
 
-function maybeClickLink() {
-  if (gTabLoaded && gLeftFrameVisited) {
-    // Click on the link in the left frame to cause a page load in the
-    // right frame.
-    EventUtils.sendMouseEvent({type: "click"}, "clickme", content.frames[0]);
+  // Wait for the left frame visit to be registered.
+  info("Waiting left frame visit");
+  yield deferredLeftFrameVisit.promise;
+
+  // Click on the link in the left frame to cause a page load in the
+  // right frame.
+  info("Clicking link");
+  yield ContentTask.spawn(tab.linkedBrowser, {}, function* () {
+    content.frames[0].document.getElementById("clickme").click();
+  });
+
+  // Wait for the right frame visit to be registered.
+  info("Waiting right frame visit");
+  yield deferredRightFrameVisit.promise;
+
+  yield BrowserTestUtils.removeTab(tab);
+});
+
+function* getTransitionForUrl(url) {
+  // Ensure all the transactions completed.
+  yield PlacesTestUtils.promiseAsyncUpdates();
+  let db = yield PlacesUtils.promiseDBConnection();
+  let rows = yield db.execute(`
+    SELECT visit_type
+    FROM moz_historyvisits
+    WHERE place_id = (SELECT id FROM moz_places WHERE url = :url)`,
+    { url });
+  if (rows.length) {
+    return rows[0].getResultByName("visit_type");
   }
+  return null;
 }
-
-function getTransitionForUrl(aUrl)
-{
-  let dbConn = PlacesUtils.history
-                          .QueryInterface(Ci.nsPIPlacesDatabase).DBConnection;
-  let stmt = dbConn.createStatement(
-    "SELECT visit_type FROM moz_historyvisits WHERE place_id = " +
-      "(SELECT id FROM moz_places WHERE url = :page_url)");
-  stmt.params.page_url = aUrl;
-  try {
-    if (!stmt.executeStep()) {
-      return null;
-    }
-    return stmt.row.visit_type;
-  }
-  finally {
-    stmt.finalize();
-  }
-}
-
-registerCleanupFunction(function ()
-{
-  gBrowser.removeTab(gBrowser.selectedTab);
-  Services.obs.removeObserver(observer, "uri-visit-saved");
-})
diff --git a/browser/components/tests/unit/distribution.ini b/browser/components/tests/unit/distribution.ini
index 618fa1ebfa7f..d7d29880833b 100644
--- a/browser/components/tests/unit/distribution.ini
+++ b/browser/components/tests/unit/distribution.ini
@@ -13,6 +13,28 @@ distribution.test.string.noquotes=Test String
 distribution.test.int=777
 distribution.test.bool.true=true
 distribution.test.bool.false=false
+distribution.test.empty=
+
+distribution.test.pref.locale="%LOCALE%"
+distribution.test.pref.language.reset="Preference Set"
+distribution.test.pref.locale.reset="Preference Set"
+distribution.test.pref.locale.set="Preference Set"
+distribution.test.pref.language.set="Preference Set"
+
+[Preferences-en]
+distribution.test.pref.language.en="en"
+distribution.test.pref.language.reset=
+distribution.test.pref.language.set="Language Set"
+distribution.test.pref.locale.set="Language Set"
+
+[Preferences-en-US]
+distribution.test.pref.locale.en-US="en-US"
+distribution.test.pref.locale.reset=
+distribution.test.pref.locale.set="Locale Set"
+
+
+[Preferences-de]
+distribution.test.pref.language.de="de"
 
 [LocalizablePreferences]
 distribution.test.locale="%LOCALE%"
@@ -33,4 +55,4 @@ distribution.test.locale.reset=
 distribution.test.locale.set="Locale Set"
 
 [LocalizablePreferences-de]
-distribution.test.locale.de="de"
+distribution.test.language.de="de"
diff --git a/browser/components/tests/unit/test_distribution.js b/browser/components/tests/unit/test_distribution.js
index efb2e6b2a71a..15353a4b44db 100644
--- a/browser/components/tests/unit/test_distribution.js
+++ b/browser/components/tests/unit/test_distribution.js
@@ -71,10 +71,30 @@ add_task(function* () {
   Assert.equal(Services.prefs.getIntPref("distribution.test.int"), 777);
   Assert.equal(Services.prefs.getBoolPref("distribution.test.bool.true"), true);
   Assert.equal(Services.prefs.getBoolPref("distribution.test.bool.false"), false);
+
+  Assert.throws(() => Services.prefs.getCharPref("distribution.test.empty"));
+  Assert.throws(() => Services.prefs.getIntPref("distribution.test.empty"));
+  Assert.throws(() => Services.prefs.getBoolPref("distribution.test.empty"));
+
+  Assert.equal(Services.prefs.getCharPref("distribution.test.pref.locale"), "en-US");
+  Assert.equal(Services.prefs.getCharPref("distribution.test.pref.language.en"), "en");
+  Assert.equal(Services.prefs.getCharPref("distribution.test.pref.locale.en-US"), "en-US");
+  Assert.throws(() => Services.prefs.getCharPref("distribution.test.pref.language.de"));
+  // This value was never set because of the empty language specific pref
+  Assert.throws(() => Services.prefs.getCharPref("distribution.test.pref.language.reset"));
+  // This value was never set because of the empty locale specific pref
+  Assert.throws(() => Services.prefs.getCharPref("distribution.test.pref.locale.reset"));
+  // This value was overridden by a locale specific setting
+  Assert.equal(Services.prefs.getCharPref("distribution.test.pref.locale.set"), "Locale Set");
+  // This value was overridden by a language specific setting
+  Assert.equal(Services.prefs.getCharPref("distribution.test.pref.language.set"), "Language Set");
+  // Language should not override locale
+  Assert.notEqual(Services.prefs.getCharPref("distribution.test.pref.locale.set"), "Language Set");
+
   Assert.equal(Services.prefs.getComplexValue("distribution.test.locale", Ci.nsIPrefLocalizedString).data, "en-US");
   Assert.equal(Services.prefs.getComplexValue("distribution.test.language.en", Ci.nsIPrefLocalizedString).data, "en");
   Assert.equal(Services.prefs.getComplexValue("distribution.test.locale.en-US", Ci.nsIPrefLocalizedString).data, "en-US");
-  Assert.throws(() => Services.prefs.getComplexValue("distribution.test.locale.de", Ci.nsIPrefLocalizedString));
+  Assert.throws(() => Services.prefs.getComplexValue("distribution.test.language.de", Ci.nsIPrefLocalizedString));
   // This value was never set because of the empty language specific pref
   Assert.throws(() => Services.prefs.getComplexValue("distribution.test.language.reset", Ci.nsIPrefLocalizedString));
   // This value was never set because of the empty locale specific pref
diff --git a/browser/modules/ContentClick.jsm b/browser/modules/ContentClick.jsm
index 9f717f1146e1..9053d4d3d447 100644
--- a/browser/modules/ContentClick.jsm
+++ b/browser/modules/ContentClick.jsm
@@ -61,6 +61,15 @@ var ContentClick = {
 
     // Note: We don't need the sidebar code here.
 
+    // Mark the page as a user followed link.  This is done so that history can
+    // distinguish automatic embed visits from user activated ones.  For example
+    // pages loaded in frames are embed visits and lost with the session, while
+    // visits across frames should be preserved.
+    try {
+      if (!PrivateBrowsingUtils.isWindowPrivate(window))
+        PlacesUIUtils.markPageAsFollowedLink(json.href);
+    } catch (ex) { /* Skip invalid URIs. */ }
+
     // This part is based on handleLinkClick.
     var where = window.whereToOpenLink(json);
     if (where == "current")
@@ -73,14 +82,5 @@ var ContentClick = {
                    referrerPolicy: json.referrerPolicy,
                    noReferrer: json.noReferrer };
     window.openLinkIn(json.href, where, params);
-
-    // Mark the page as a user followed link.  This is done so that history can
-    // distinguish automatic embed visits from user activated ones.  For example
-    // pages loaded in frames are embed visits and lost with the session, while
-    // visits across frames should be preserved.
-    try {
-      if (!PrivateBrowsingUtils.isWindowPrivate(window))
-        PlacesUIUtils.markPageAsFollowedLink(json.href);
-    } catch (ex) { /* Skip invalid URIs. */ }
   }
 };
diff --git a/browser/themes/osx/controlcenter/panel.css b/browser/themes/osx/controlcenter/panel.css
index ce69838f3b18..f6c868a98bb1 100644
--- a/browser/themes/osx/controlcenter/panel.css
+++ b/browser/themes/osx/controlcenter/panel.css
@@ -17,6 +17,15 @@
   @hudButtonFocused@
 }
 
+#identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews {
+  border-bottom-right-radius: 3.5px;
+}
+
+#identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews:-moz-locale-dir(rtl) {
+  border-bottom-right-radius: 0;
+  border-bottom-left-radius: 3.5px;
+}
+
 #tracking-action-block,
 #tracking-action-unblock,
 #tracking-action-unblock-private,
diff --git a/browser/themes/shared/controlcenter/panel.inc.css b/browser/themes/shared/controlcenter/panel.inc.css
index 2e3ecb561229..a83f5fb7ba50 100644
--- a/browser/themes/shared/controlcenter/panel.inc.css
+++ b/browser/themes/shared/controlcenter/panel.inc.css
@@ -83,15 +83,9 @@
 
 #identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews {
   background: var(--panel-arrowcontent-background);
-  border-bottom-right-radius: 3.5px;
   padding: 0;
 }
 
-#identity-popup-multiView > .panel-viewcontainer > .panel-viewstack > .panel-subviews:-moz-locale-dir(rtl) {
-  border-bottom-right-radius: 0;
-  border-bottom-left-radius: 3.5px;
-}
-
 .identity-popup-section:not(:first-child) {
   border-top: 1px solid var(--panel-separator-color);
 }
@@ -100,14 +94,19 @@
 #identity-popup-security-content,
 #identity-popup-permissions-content,
 #tracking-protection-content {
-  padding: 0.5em 0 1em;
-  -moz-padding-start: calc(2em + 24px);
-  -moz-padding-end: 1em;
   background-repeat: no-repeat;
   background-position: 1em 1em;
   background-size: 24px auto;
 }
 
+#identity-popup-security-content,
+#identity-popup-permissions-content,
+#tracking-protection-content {
+  padding: 0.5em 0 1em;
+  -moz-padding-start: calc(2em + 24px);
+  -moz-padding-end: 1em;
+}
+
 #identity-popup-securityView:-moz-locale-dir(rtl),
 #identity-popup-security-content:-moz-locale-dir(rtl),
 #identity-popup-permissions-content:-moz-locale-dir(rtl),
@@ -208,7 +207,6 @@
 }
 
 #identity-popup-securityView {
-  padding-bottom: 2em;
   overflow: hidden;
 }
 
@@ -252,7 +250,14 @@
   color: Graytext;
 }
 
+#identity-popup-securityView-header,
+#identity-popup-securityView-body {
+  -moz-margin-start: calc(2em + 24px);
+  -moz-margin-end: 1em;
+}
+
 #identity-popup-securityView-header {
+  margin-top: 0.5em;
   border-bottom: 1px solid var(--panel-separator-color);
   padding-bottom: 1em;
 }
@@ -261,6 +266,30 @@
   -moz-padding-end: 1em;
 }
 
+#identity-popup-securityView-footer {
+  margin-top: 1em;
+  background-color: hsla(210,4%,10%,.07);
+}
+
+#identity-popup-securityView-footer > button {
+  -moz-appearance: none;
+  margin: 0;
+  border: none;
+  border-top: 1px solid #ccc;
+  padding: 8px 20px;
+  color: ButtonText;
+  background-color: transparent;
+}
+
+#identity-popup-securityView-footer > button:hover,
+#identity-popup-securityView-footer > button:focus {
+  background-color: hsla(210,4%,10%,.07);
+}
+
+#identity-popup-securityView-footer > button:hover:active {
+  background-color: hsla(210,4%,10%,.12);
+}
+
 #identity-popup-content-verifier ~ description {
   margin-top: 1em;
   color: Graytext;
diff --git a/devtools/bootstrap.js b/devtools/bootstrap.js
index 7f5e5bbc516e..5f0e56160803 100644
--- a/devtools/bootstrap.js
+++ b/devtools/bootstrap.js
@@ -8,6 +8,13 @@ const Cu = Components.utils;
 const Ci = Components.interfaces;
 const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 
+function actionOccurred(id) {
+  let {require} = Cu.import("resource://devtools/shared/Loader.jsm", {});
+  let Telemetry = require("devtools/client/shared/telemetry");;
+  let telemetry = new Telemetry();
+  telemetry.actionOccurred(id);
+}
+
 // Helper to listen to a key on all windows
 function MultiWindowKeyListener({ keyCode, ctrlKey, altKey, callback }) {
   let keyListener = function (event) {
@@ -150,6 +157,8 @@ function reload(event) {
       gDevTools.showToolbox(target);
     }, 1000);
   }
+
+  actionOccurred("reloadAddonReload");
 }
 
 let listener;
@@ -165,5 +174,7 @@ function shutdown() {
   listener.stop();
   listener = null;
 }
-function install() {}
+function install() {
+  actionOccurred("reloadAddonInstalled");
+}
 function uninstall() {}
diff --git a/devtools/client/debugger/debugger-controller.js b/devtools/client/debugger/debugger-controller.js
index 388b9e632865..12f753b34de4 100644
--- a/devtools/client/debugger/debugger-controller.js
+++ b/devtools/client/debugger/debugger-controller.js
@@ -82,7 +82,10 @@ const EVENTS = {
   OPTIONS_POPUP_HIDDEN: "Debugger:OptionsPopupHidden",
 
   // When the widgets layout has been changed.
-  LAYOUT_CHANGED: "Debugger:LayoutChanged"
+  LAYOUT_CHANGED: "Debugger:LayoutChanged",
+
+  // When a worker has been selected.
+  WORKER_SELECTED: "Debugger::WorkerSelected"
 };
 
 // Descriptions for what a stack frame represents after the debugger pauses.
@@ -108,7 +111,7 @@ Cu.import("resource://devtools/client/shared/widgets/ViewHelpers.jsm");
 var L10N = new ViewHelpers.L10N(DBG_STRINGS_URI);
 
 Cu.import("resource://devtools/client/shared/browser-loader.js");
-const require = BrowserLoader("resource://devtools/client/debugger/", this).require;
+const require = BrowserLoader("resource://devtools/client/debugger/", window).require;
 XPCOMUtils.defineConstant(this, "require", require);
 const { gDevTools } = require("devtools/client/framework/devtools");
 
@@ -491,8 +494,8 @@ Workers.prototype = {
 
       for (let workerActor in this._workerForms) {
         if (!(workerActor in workerForms)) {
+          DebuggerView.Workers.removeWorker(this._workerForms[workerActor]);
           delete this._workerForms[workerActor];
-          DebuggerView.Workers.removeWorker(workerActor);
         }
       }
 
@@ -500,7 +503,7 @@ Workers.prototype = {
         if (!(workerActor in this._workerForms)) {
           let workerForm = workerForms[workerActor];
           this._workerForms[workerActor] = workerForm;
-          DebuggerView.Workers.addWorker(workerActor, workerForm.url);
+          DebuggerView.Workers.addWorker(workerForm);
         }
       }
     });
@@ -510,10 +513,11 @@ Workers.prototype = {
     this._updateWorkerList();
   },
 
-  _onWorkerSelect: function (workerActor) {
-    DebuggerController.client.attachWorker(workerActor, (response, workerClient) => {
-      gDevTools.showToolbox(TargetFactory.forWorker(workerClient),
-                            "jsdebugger", Toolbox.HostType.WINDOW);
+  _onWorkerSelect: function (workerForm) {
+    DebuggerController.client.attachWorker(workerForm.actor, (response, workerClient) => {
+      let toolbox = gDevTools.showToolbox(TargetFactory.forWorker(workerClient),
+                                          "jsdebugger", Toolbox.HostType.WINDOW);
+      window.emit(EVENTS.WORKER_SELECTED, toolbox);
     });
   }
 };
diff --git a/devtools/client/debugger/test/mochitest/browser.ini b/devtools/client/debugger/test/mochitest/browser.ini
index 5b13be24926e..b3a1fae21279 100644
--- a/devtools/client/debugger/test/mochitest/browser.ini
+++ b/devtools/client/debugger/test/mochitest/browser.ini
@@ -45,6 +45,9 @@ support-files =
   code_ugly-7.js
   code_ugly-8
   code_ugly-8^headers^
+  code_worker-source-map.coffee
+  code_worker-source-map.js
+  code_worker-source-map.js.map
   code_WorkerActor.attach-worker1.js
   code_WorkerActor.attach-worker2.js
   code_WorkerActor.attachThread-worker.js
@@ -112,6 +115,7 @@ support-files =
   doc_watch-expressions.html
   doc_watch-expression-button.html
   doc_with-frame.html
+  doc_worker-source-map.html
   doc_WorkerActor.attach-tab1.html
   doc_WorkerActor.attach-tab2.html
   doc_WorkerActor.attachThread-tab.html
@@ -592,6 +596,8 @@ skip-if = e10s && debug
 skip-if = e10s && debug
 [browser_dbg_worker-console.js]
 skip-if = e10s && debug
+[browser_dbg_worker-source-map.js]
+skip-if = e10s && debug
 [browser_dbg_worker-window.js]
 skip-if = e10s && debug
 [browser_dbg_WorkerActor.attach.js]
diff --git a/devtools/client/debugger/test/mochitest/browser_dbg_worker-source-map.js b/devtools/client/debugger/test/mochitest/browser_dbg_worker-source-map.js
new file mode 100644
index 000000000000..bbedaff097fc
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/browser_dbg_worker-source-map.js
@@ -0,0 +1,85 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+const TAB_URL = EXAMPLE_URL + "doc_worker-source-map.html";
+const WORKER_URL = "code_worker-source-map.js";
+const COFFEE_URL = EXAMPLE_URL + "code_worker-source-map.coffee";
+
+function selectWorker(aPanel, aURL) {
+  let panelWin = aPanel.panelWin;
+  let promise = waitForDebuggerEvents(aPanel, panelWin.EVENTS.WORKER_SELECTED);
+  let Workers = panelWin.DebuggerView.Workers;
+  let item = Workers.getItemForAttachment((workerForm) => {
+    return workerForm.url === aURL;
+  });
+  Workers.selectedItem = item;
+  return promise;
+}
+
+function test() {
+  return Task.spawn(function* () {
+    yield pushPrefs(["devtools.debugger.workers", true]);
+
+    let [tab,, panel] = yield initDebugger(TAB_URL);
+    let toolbox = yield selectWorker(panel, WORKER_URL);
+    let workerPanel = toolbox.getCurrentPanel();
+    yield waitForSourceShown(workerPanel, ".coffee");
+    let panelWin = workerPanel.panelWin;
+    let Sources = panelWin.DebuggerView.Sources;
+    let editor = panelWin.DebuggerView.editor;
+    let threadClient = panelWin.gThreadClient;
+
+    isnot(Sources.selectedItem.attachment.source.url.indexOf(".coffee"), -1,
+          "The debugger should show the source mapped coffee source file.");
+    is(Sources.selectedValue.indexOf(".js"), -1,
+       "The debugger should not show the generated js source file.");
+    is(editor.getText().indexOf("isnt"), 211,
+       "The debugger's editor should have the coffee source source displayed.");
+    is(editor.getText().indexOf("function"), -1,
+       "The debugger's editor should not have the JS source displayed.");
+
+    yield threadClient.interrupt();
+    let sourceForm = getSourceForm(Sources, COFFEE_URL);
+    let source = threadClient.source(sourceForm);
+    let response = yield source.setBreakpoint({ line: 5 });
+
+    ok(!response.error,
+      "Should be able to set a breakpoint in a coffee source file.");
+    ok(!response.actualLocation,
+      "Should be able to set a breakpoint on line 5.");
+
+    let promise = new Promise((resolve) => {
+      threadClient.addOneTimeListener("paused", (event, packet) => {
+        is(packet.type, "paused",
+          "We should now be paused again.");
+        is(packet.why.type, "breakpoint",
+          "and the reason we should be paused is because we hit a breakpoint.");
+
+        // Check that we stopped at the right place, by making sure that the
+        // environment is in the state that we expect.
+        is(packet.frame.environment.bindings.variables.start.value, 0,
+           "'start' is 0.");
+        is(packet.frame.environment.bindings.variables.stop.value.type, "undefined",
+           "'stop' hasn't been assigned to yet.");
+        is(packet.frame.environment.bindings.variables.pivot.value.type, "undefined",
+           "'pivot' hasn't been assigned to yet.");
+
+        waitForCaretUpdated(workerPanel, 5).then(resolve);
+      });
+    });
+
+    // This will cause the breakpoint to be hit, and put us back in the
+    // paused state.
+    yield threadClient.resume();
+    callInTab(tab, "binary_search", [0, 2, 3, 5, 7, 10], 5);
+    yield promise;
+
+    yield threadClient.resume();
+    yield toolbox.destroy();
+    yield closeDebuggerAndFinish(panel);
+
+    yield popPrefs();
+  });
+}
diff --git a/devtools/client/debugger/test/mochitest/code_worker-source-map.coffee b/devtools/client/debugger/test/mochitest/code_worker-source-map.coffee
new file mode 100644
index 000000000000..446e3aefe946
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/code_worker-source-map.coffee
@@ -0,0 +1,22 @@
+# Uses a binary search algorithm to locate a value in the specified array.
+binary_search = (items, value) ->
+
+  start = 0
+  stop  = items.length - 1
+  pivot = Math.floor (start + stop) / 2
+
+  while items[pivot] isnt value and start < stop
+
+    # Adjust the search area.
+    stop  = pivot - 1 if value < items[pivot]
+    start = pivot + 1 if value > items[pivot]
+
+    # Recalculate the pivot.
+    pivot = Math.floor (stop + start) / 2
+
+  # Make sure we've found the correct value.
+  if items[pivot] is value then pivot else -1
+
+self.onmessage = (event) ->
+  data = event.data
+  binary_search(data.items, data.value)
diff --git a/devtools/client/debugger/test/mochitest/code_worker-source-map.js b/devtools/client/debugger/test/mochitest/code_worker-source-map.js
new file mode 100644
index 000000000000..9a9f541a9560
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/code_worker-source-map.js
@@ -0,0 +1,35 @@
+// Generated by CoffeeScript 1.10.0
+(function() {
+  var binary_search;
+
+  binary_search = function(items, value) {
+    var pivot, start, stop;
+    start = 0;
+    stop = items.length - 1;
+    pivot = Math.floor((start + stop) / 2);
+    while (items[pivot] !== value && start < stop) {
+      if (value < items[pivot]) {
+        stop = pivot - 1;
+      }
+      if (value > items[pivot]) {
+        start = pivot + 1;
+      }
+      pivot = Math.floor((stop + start) / 2);
+    }
+    if (items[pivot] === value) {
+      return pivot;
+    } else {
+      return -1;
+    }
+  };
+
+  self.onmessage = function(event) {
+    console.log("EUTA");
+    var data;
+    data = event.data;
+    return binary_search(data.items, data.value);
+  };
+
+}).call(this);
+
+//# sourceMappingURL=code_worker-source-map.js.map
diff --git a/devtools/client/debugger/test/mochitest/code_worker-source-map.js.map b/devtools/client/debugger/test/mochitest/code_worker-source-map.js.map
new file mode 100644
index 000000000000..97c801a58418
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/code_worker-source-map.js.map
@@ -0,0 +1,10 @@
+{
+  "version": 3,
+  "file": "code_worker-source-map.js",
+  "sourceRoot": "",
+  "sources": [
+    "code_worker-source-map.coffee"
+  ],
+  "names": [],
+  "mappings": ";AACA;AAAA,MAAA;;EAAA,aAAA,GAAgB,SAAC,KAAD,EAAQ,KAAR;AAEd,QAAA;IAAA,KAAA,GAAQ;IACR,IAAA,GAAQ,KAAK,CAAC,MAAN,GAAe;IACvB,KAAA,GAAQ,IAAI,CAAC,KAAL,CAAW,CAAC,KAAA,GAAQ,IAAT,CAAA,GAAiB,CAA5B;AAER,WAAM,KAAM,CAAA,KAAA,CAAN,KAAkB,KAAlB,IAA4B,KAAA,GAAQ,IAA1C;MAGE,IAAqB,KAAA,GAAQ,KAAM,CAAA,KAAA,CAAnC;QAAA,IAAA,GAAQ,KAAA,GAAQ,EAAhB;;MACA,IAAqB,KAAA,GAAQ,KAAM,CAAA,KAAA,CAAnC;QAAA,KAAA,GAAQ,KAAA,GAAQ,EAAhB;;MAGA,KAAA,GAAQ,IAAI,CAAC,KAAL,CAAW,CAAC,IAAA,GAAO,KAAR,CAAA,GAAiB,CAA5B;IAPV;IAUA,IAAG,KAAM,CAAA,KAAA,CAAN,KAAgB,KAAnB;aAA8B,MAA9B;KAAA,MAAA;aAAyC,CAAC,EAA1C;;EAhBc;;EAkBhB,IAAI,CAAC,SAAL,GAAiB,SAAC,KAAD;AACf,QAAA;IAAA,IAAA,GAAO,KAAK,CAAC;WACb,aAAA,CAAc,IAAI,CAAC,KAAnB,EAA0B,IAAI,CAAC,KAA/B;EAFe;AAlBjB"
+}
diff --git a/devtools/client/debugger/test/mochitest/doc_worker-source-map.html b/devtools/client/debugger/test/mochitest/doc_worker-source-map.html
new file mode 100644
index 000000000000..20a14e351932
--- /dev/null
+++ b/devtools/client/debugger/test/mochitest/doc_worker-source-map.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8"/>
+    <script>
+      var worker = new Worker("code_worker-source-map.js");
+
+      function binary_search(items, value) {
+        worker.postMessage({
+          items: items,
+          value: value
+        });
+      }
+    </script>
+  </head>
+  <body>
+  </body>
+</html>
diff --git a/devtools/client/debugger/views/workers-view.js b/devtools/client/debugger/views/workers-view.js
index 4869f369bca9..1dc86770a460 100644
--- a/devtools/client/debugger/views/workers-view.js
+++ b/devtools/client/debugger/views/workers-view.js
@@ -28,22 +28,24 @@ WorkersView.prototype = Heritage.extend(WidgetMethods, {
     this.widget.addEventListener("select", this._onWorkerSelect, false);
   },
 
-  addWorker: function (actor, name) {
+  addWorker: function (workerForm) {
     let element = document.createElement("label");
     element.className = "plain dbg-worker-item";
-    element.setAttribute("value", name);
+    element.setAttribute("value", workerForm.url);
     element.setAttribute("flex", "1");
 
-    this.push([element, actor], {});
+    this.push([element, workerForm.actor], {
+      attachment: workerForm
+    });
   },
 
-  removeWorker: function (actor) {
-    this.remove(this.getItemByValue(actor));
+  removeWorker: function (workerForm) {
+    this.remove(this.getItemByValue(workerForm.actor));
   },
 
   _onWorkerSelect: function () {
     if (this.selectedItem !== null) {
-      DebuggerController.Workers._onWorkerSelect(this.selectedItem.value);
+      DebuggerController.Workers._onWorkerSelect(this.selectedItem.attachment);
       this.selectedItem = null;
     }
   }
diff --git a/devtools/client/framework/toolbox.js b/devtools/client/framework/toolbox.js
index b0b20c5c97f1..8f266fc51c37 100644
--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -912,6 +912,10 @@ Toolbox.prototype = {
     if (!this.target.hasActor("gcli")) {
       return promise.resolve();
     }
+    // Disable gcli in browser toolbox until there is usages of it
+    if (this.target.chrome) {
+      return promise.resolve();
+    }
 
     const options = {
       environment: CommandUtils.createEnvironment(this, '_target')
diff --git a/devtools/client/shared/telemetry.js b/devtools/client/shared/telemetry.js
index 462798003ca3..2532b00f04aa 100644
--- a/devtools/client/shared/telemetry.js
+++ b/devtools/client/shared/telemetry.js
@@ -233,7 +233,15 @@ Telemetry.prototype = {
       histogram: "DEVTOOLS_CUSTOM_OPENED_COUNT",
       userHistogram: "DEVTOOLS_CUSTOM_OPENED_PER_USER_FLAG",
       timerHistogram: "DEVTOOLS_CUSTOM_TIME_ACTIVE_SECONDS"
-    }
+    },
+    reloadAddonInstalled: {
+      histogram: "DEVTOOLS_RELOAD_ADDON_INSTALLED_COUNT",
+      userHistogram: "DEVTOOLS_RELOAD_ADDON_INSTALLED_PER_USER_FLAG",
+    },
+    reloadAddonReload: {
+      histogram: "DEVTOOLS_RELOAD_ADDON_RELOAD_COUNT",
+      userHistogram: "DEVTOOLS_RELOAD_ADDON_RELOAD_PER_USER_FLAG",
+    },
   },
 
   /**
diff --git a/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java b/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
index d5ffddf48aef..780670fd2b98 100644
--- a/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/BrowserDatabaseHelper.java
@@ -1150,6 +1150,8 @@ public final class BrowserDatabaseHelper extends SQLiteOpenHelper {
                     upgradeDatabaseFrom25to26(db);
                     break;
 
+                // case 27 occurs in UrlMetadataTable.onUpgrade
+
                 case 28:
                     upgradeDatabaseFrom27to28(db);
                     break;
diff --git a/mobile/android/base/java/org/mozilla/gecko/db/BrowserProvider.java b/mobile/android/base/java/org/mozilla/gecko/db/BrowserProvider.java
index cc11cd058f67..fca5b355a86d 100644
--- a/mobile/android/base/java/org/mozilla/gecko/db/BrowserProvider.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/BrowserProvider.java
@@ -12,6 +12,7 @@ import java.util.Map;
 
 import org.mozilla.gecko.AboutPages;
 import org.mozilla.gecko.GeckoProfile;
+import org.mozilla.gecko.R;
 import org.mozilla.gecko.db.BrowserContract.Bookmarks;
 import org.mozilla.gecko.db.BrowserContract.Combined;
 import org.mozilla.gecko.db.BrowserContract.FaviconColumns;
@@ -694,21 +695,25 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
 
         final String TABLE_TOPSITES = "topsites";
 
-        final String totalLimit = uri.getQueryParameter(BrowserContract.PARAM_LIMIT);
-        final String suggestedGridLimit = uri.getQueryParameter(BrowserContract.PARAM_SUGGESTEDSITES_LIMIT);
+        final String limitParam = uri.getQueryParameter(BrowserContract.PARAM_LIMIT);
+        final String gridLimitParam = uri.getQueryParameter(BrowserContract.PARAM_SUGGESTEDSITES_LIMIT);
 
-        final String[] suggestedGridLimitArgs = new String[] {
-                suggestedGridLimit
-        };
+        final int totalLimit;
+        final int suggestedGridLimit;
 
-        final String[] totalLimitArgs = new String[] {
-                totalLimit
-        };
+        if (limitParam == null) {
+            totalLimit = 50;
+        } else {
+            totalLimit = Integer.parseInt(limitParam, 10);
+        }
 
-        final String pinnedSitesFromClause = "FROM " + TABLE_BOOKMARKS + " WHERE " + Bookmarks.PARENT + " == ?";
-        final String[] pinnedSitesArgs = new String[] {
-                String.valueOf(Bookmarks.FIXED_PINNED_LIST_ID)
-        };
+        if (gridLimitParam == null) {
+            suggestedGridLimit = getContext().getResources().getInteger(R.integer.number_of_top_sites);
+        } else {
+            suggestedGridLimit = Integer.parseInt(gridLimitParam, 10);
+        }
+
+        final String pinnedSitesFromClause = "FROM " + TABLE_BOOKMARKS + " WHERE " + Bookmarks.PARENT + " == " + Bookmarks.FIXED_PINNED_LIST_ID;
 
         // Ideally we'd use a recursive CTE to generate our sequence, e.g. something like this worked at one point:
         // " WITH RECURSIVE" +
@@ -725,12 +730,7 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                 " ON numbers.position > free_ids.position" +
                 " GROUP BY numbers.position" +
                 " ORDER BY numbers.position ASC" +
-                " LIMIT ?";
-
-        final String[] freeIDArgs = DBUtils.concatenateSelectionArgs(
-                pinnedSitesArgs,
-                pinnedSitesArgs,
-                suggestedGridLimitArgs);
+                " LIMIT " + suggestedGridLimit;
 
         // Filter out: unvisited pages (history_id == -1) pinned (and other special) sites, deleted sites,
         // and about: pages.
@@ -739,17 +739,15 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                 " AND " +
                 Combined.URL + " NOT IN (SELECT " +
                 Bookmarks.URL + " FROM bookmarks WHERE " +
-                DBUtils.qualifyColumn("bookmarks", Bookmarks.PARENT) + " < ? AND " +
+                DBUtils.qualifyColumn("bookmarks", Bookmarks.PARENT) + " < " + Bookmarks.FIXED_ROOT_ID + " AND " +
                 DBUtils.qualifyColumn("bookmarks", Bookmarks.IS_DELETED) + " == 0)" +
                 " AND " +
                 "(" + Combined.URL + " NOT LIKE ?)";
 
         final String[] ignoreForTopSitesArgs = new String[] {
-                String.valueOf(Bookmarks.FIXED_ROOT_ID),
                 AboutPages.URL_FILTER
         };
 
-
         // Stuff the suggested sites into SQL: this allows us to filter pinned and topsites out of the suggested
         // sites list as part of the final query (as opposed to walking cursors in java)
         final SuggestedSites suggestedSites = GeckoProfile.get(getContext(), uri.getQueryParameter(BrowserContract.PARAM_PROFILE)).getDB().getSuggestedSites();
@@ -759,7 +757,7 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
         // sites list, which means we'd need to process the lists within SuggestedSites in any case. If we're doing
         // that processing, there is little real between us using a MatrixCursor, or a Map (or List) instead of the
         // MatrixCursor.
-        final Cursor suggestedSitesCursor = suggestedSites.get(Integer.parseInt(suggestedGridLimit));
+        final Cursor suggestedSitesCursor = suggestedSites.get(suggestedGridLimit);
 
         String[] suggestedSiteArgs = new String[0];
 
@@ -791,11 +789,8 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
 
         // To restrict suggested sites to the grid, we simply subtract the number of topsites (which have already had
         // the pinned sites filtered out), and the number of pinned sites.
-        // SQLite completely ignores negative limits, hence we need to manually totalLimit to 0 in this case.
-        final String suggestedLimitClause = " LIMIT MAX(0, (? - (SELECT COUNT(*) FROM " + TABLE_TOPSITES + ") - (SELECT COUNT(*) " + pinnedSitesFromClause + "))) ";
-
-        final String[] suggestedLimitArgs = DBUtils.concatenateSelectionArgs(suggestedGridLimitArgs,
-                                                                             pinnedSitesArgs);
+        // SQLite completely ignores negative limits, hence we need to manually limit to 0 in this case.
+        final String suggestedLimitClause = " LIMIT MAX(0, (" + suggestedGridLimit + " - (SELECT COUNT(*) FROM " + TABLE_TOPSITES + ") - (SELECT COUNT(*) " + pinnedSitesFromClause + "))) ";
 
         db.beginTransaction();
         try {
@@ -813,10 +808,9 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                        " FROM " + Combined.VIEW_NAME +
                        " WHERE " + ignoreForTopSitesWhereClause +
                        " ORDER BY " + BrowserContract.getFrecencySortOrder(true, false) +
-                       " LIMIT ?",
+                       " LIMIT " + totalLimit,
 
-                       DBUtils.appendSelectionArgs(ignoreForTopSitesArgs,
-                                                   totalLimitArgs));
+                       ignoreForTopSitesArgs);
 
             if (!hasProcessedAnySuggestedSites) {
                 db.execSQL("INSERT INTO " + TABLE_TOPSITES +
@@ -838,11 +832,17 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                            Bookmarks.URL + " NOT IN (SELECT url " + pinnedSitesFromClause + ")" +
                            suggestedLimitClause + " )",
 
-                           DBUtils.concatenateSelectionArgs(suggestedSiteArgs,
-                                                            pinnedSitesArgs,
-                                                            suggestedLimitArgs));
+                           suggestedSiteArgs);
             }
 
+            // If we retrieve more topsites than we have free positions for in the freeIdSubquery,
+            // we will have topsites that don't receive a position when joining TABLE_TOPSITES
+            // with freeIdSubquery. Hence we need to coalesce the position with a generated position.
+            // We know that the difference in positions will be at most suggestedGridLimit, hence we
+            // can add that to the rowid to generate a safe position.
+            // I.e. if we have 6 pinned sites then positions 0..5 are filled, the JOIN results in
+            // the first N rows having positions 6..(N+6), so row N+1 should receive a position that is at
+            // least N+1+6, which is equal to rowid + 6.
             final SQLiteCursor c = (SQLiteCursor) db.rawQuery(
                         "SELECT " +
                         Bookmarks._ID + ", " +
@@ -850,7 +850,9 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                         TopSites.HISTORY_ID + ", " +
                         Bookmarks.URL + ", " +
                         Bookmarks.TITLE + ", " +
-                        Bookmarks.POSITION + ", " +
+                        "COALESCE(" + Bookmarks.POSITION + ", " +
+                            DBUtils.qualifyColumn(TABLE_TOPSITES, "rowid") + " + " + suggestedGridLimit +
+                        ")" + " AS " + Bookmarks.POSITION + ", " +
                         Combined.HISTORY_ID + ", " +
                         TopSites.TYPE +
                         " FROM " + TABLE_TOPSITES +
@@ -871,12 +873,11 @@ public class BrowserProvider extends SharedBrowserDatabaseProvider {
                         "NULL AS " + Combined.HISTORY_ID + ", " +
                         TopSites.TYPE_PINNED + " as " + TopSites.TYPE +
                         " FROM " + TABLE_BOOKMARKS +
-                        " WHERE " + Bookmarks.PARENT + " == ? " +
+                        " WHERE " + Bookmarks.PARENT + " == " + Bookmarks.FIXED_PINNED_LIST_ID +
 
                         " ORDER BY " + Bookmarks.POSITION,
 
-                         DBUtils.appendSelectionArgs(freeIDArgs,
-                                                     pinnedSitesArgs));
+                        null);
 
             c.setNotificationUri(getContext().getContentResolver(),
                                  BrowserContract.AUTHORITY_URI);
diff --git a/mobile/android/base/java/org/mozilla/gecko/db/LocalURLMetadata.java b/mobile/android/base/java/org/mozilla/gecko/db/LocalURLMetadata.java
index e8615dbff42e..b369d5bcd2b0 100644
--- a/mobile/android/base/java/org/mozilla/gecko/db/LocalURLMetadata.java
+++ b/mobile/android/base/java/org/mozilla/gecko/db/LocalURLMetadata.java
@@ -18,6 +18,7 @@ import org.json.JSONException;
 import org.json.JSONObject;
 import org.mozilla.gecko.GeckoAppShell;
 import org.mozilla.gecko.Telemetry;
+import org.mozilla.gecko.favicons.Favicons;
 import org.mozilla.gecko.util.ThreadUtils;
 
 import android.content.ContentResolver;
@@ -79,7 +80,6 @@ public class LocalURLMetadata implements URLMetadata {
             if (obj.has("touchIconList") &&
                     (icons = obj.getJSONObject("touchIconList")).length() > 0) {
                 int preferredSize = GeckoAppShell.getPreferredIconSize();
-                int bestSizeFound = -1;
 
                 Iterator<String> keys = icons.keys();
 
@@ -88,21 +88,8 @@ public class LocalURLMetadata implements URLMetadata {
                     sizes.add(new Integer(keys.next()));
                 }
 
-                Collections.sort(sizes);
-                for (int size : sizes) {
-                    if (size >= preferredSize) {
-                        bestSizeFound = size;
-                        break;
-                    }
-                }
-
-                // If all icons are smaller than the preferred size then we don't have an icon
-                // selected yet (bestSizeFound == -1), therefore just take the largest (last) icon.
-                if (bestSizeFound == -1) {
-                    bestSizeFound = sizes.get(sizes.size() - 1);
-                }
-
-                String iconURL = icons.getString(Integer.toString(bestSizeFound));
+                final int bestSize = Favicons.selectBestSizeFromList(sizes, preferredSize);
+                final String iconURL = icons.getString(Integer.toString(bestSize));
 
                 data.put(URLMetadataTable.TOUCH_ICON_COLUMN, iconURL);
             }
diff --git a/mobile/android/base/java/org/mozilla/gecko/favicons/Favicons.java b/mobile/android/base/java/org/mozilla/gecko/favicons/Favicons.java
index d616173bfe92..ffd919043a39 100644
--- a/mobile/android/base/java/org/mozilla/gecko/favicons/Favicons.java
+++ b/mobile/android/base/java/org/mozilla/gecko/favicons/Favicons.java
@@ -144,6 +144,32 @@ public class Favicons {
 
     private static FaviconCache faviconsCache;
 
+    /**
+     * Select the closest icon size from a list of icon sizes.
+     * We just find the first icon that is larger than the preferred size if available, or otherwise select the
+     * largest icon (if all icons are smaller than the preferred size).
+     *
+     * @return The closes icon size, or -1 if no sizes are supplied.
+     */
+    public static int selectBestSizeFromList(final List<Integer> sizes, final int preferredSize) {
+        Collections.sort(sizes);
+
+        for (int size : sizes) {
+            if (size >= preferredSize) {
+                return size;
+            }
+        }
+
+        // If all icons are smaller than the preferred size then we don't have an icon
+        // selected yet, therefore just take the largest (last) icon.
+        if (sizes.size() > 0) {
+            return sizes.get(sizes.size() - 1);
+        } else {
+            // This isn't ideal, however current code assumes this as an error value for now.
+            return -1;
+        }
+    }
+
     /**
      * Returns either NOT_LOADING, or LOADED if the onFaviconLoaded call could
      * be made on the main thread.
@@ -584,6 +610,6 @@ public class Favicons {
      */
     public static void getPreferredSizeFaviconForPage(Context context, String url, String iconURL, OnFaviconLoadedListener onFaviconLoadedListener) {
         int preferredSize = GeckoAppShell.getPreferredIconSize();
-        loadUncachedFavicon(context, url, iconURL, 0, preferredSize, onFaviconLoadedListener);
+        loadUncachedFavicon(context, url, iconURL, LoadFaviconTask.FLAG_BYPASS_CACHE_WHEN_DOWNLOADING_ICONS, preferredSize, onFaviconLoadedListener);
     }
 }
diff --git a/mobile/android/base/java/org/mozilla/gecko/favicons/LoadFaviconTask.java b/mobile/android/base/java/org/mozilla/gecko/favicons/LoadFaviconTask.java
index 9c942d26e30a..515f63cee0e1 100644
--- a/mobile/android/base/java/org/mozilla/gecko/favicons/LoadFaviconTask.java
+++ b/mobile/android/base/java/org/mozilla/gecko/favicons/LoadFaviconTask.java
@@ -25,12 +25,14 @@ import org.mozilla.gecko.util.IOUtils;
 import org.mozilla.gecko.util.ThreadUtils;
 
 import java.io.IOException;
-import java.io.InputStream;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
 import java.util.concurrent.RejectedExecutionException;
 import java.util.concurrent.atomic.AtomicInteger;
 
@@ -50,6 +52,14 @@ public class LoadFaviconTask {
     private static final HashMap<String, LoadFaviconTask> loadsInFlight = new HashMap<>();
 
     public static final int FLAG_PERSIST = 1;
+    /**
+     * Bypass all caches - this is used to directly retrieve the requested icon. Without this flag,
+     * favicons will first be pushed into the memory cache (and possibly permanent cache if using FLAG_PERSIST),
+     * where they will be downscaled to the maximum cache size, before being retrieved from the cache (resulting
+     * in a possibly smaller icon size).
+     */
+    public static final int FLAG_BYPASS_CACHE_WHEN_DOWNLOADING_ICONS = 2;
+
     private static final int MAX_REDIRECTS_TO_FOLLOW = 5;
     // The default size of the buffer to use for downloading Favicons in the event no size is given
     // by the server.
@@ -417,10 +427,13 @@ public class LoadFaviconTask {
             return null;
         }
 
+        LoadFaviconResult loadedBitmaps = null;
         // If there are no valid bitmaps decoded, the returned LoadFaviconResult is null.
-        LoadFaviconResult loadedBitmaps = loadFaviconFromDb(db);
-        if (loadedBitmaps != null) {
-            return pushToCacheAndGetResult(loadedBitmaps);
+        if ((flags & FLAG_BYPASS_CACHE_WHEN_DOWNLOADING_ICONS) == 0) {
+            loadedBitmaps = loadFaviconFromDb(db);
+            if (loadedBitmaps != null) {
+                return pushToCacheAndGetResult(loadedBitmaps);
+            }
         }
 
         if (onlyFromLocal || isCancelled()) {
@@ -445,11 +458,25 @@ public class LoadFaviconTask {
         }
 
         if (loadedBitmaps != null) {
-            // Fetching bytes to store can fail. saveFaviconToDb will
-            // do the right thing, but we still choose to cache the
-            // downloaded icon in memory.
-            saveFaviconToDb(db, loadedBitmaps.getBytesForDatabaseStorage());
-            return pushToCacheAndGetResult(loadedBitmaps);
+            if ((flags & FLAG_BYPASS_CACHE_WHEN_DOWNLOADING_ICONS) == 0) {
+                // Fetching bytes to store can fail. saveFaviconToDb will
+                // do the right thing, but we still choose to cache the
+                // downloaded icon in memory.
+                saveFaviconToDb(db, loadedBitmaps.getBytesForDatabaseStorage());
+                return pushToCacheAndGetResult(loadedBitmaps);
+            } else {
+                final Map<Integer, Bitmap> iconMap = new HashMap<>();
+                final List<Integer> sizes = new ArrayList<>();
+
+                while (loadedBitmaps.getBitmaps().hasNext()) {
+                    final Bitmap b = loadedBitmaps.getBitmaps().next();
+                    iconMap.put(b.getWidth(), b);
+                    sizes.add(b.getWidth());
+                }
+
+                int bestSize = Favicons.selectBestSizeFromList(sizes, targetWidth);
+                return iconMap.get(bestSize);
+            }
         }
 
         if (isUsingDefaultURL) {
@@ -545,11 +572,15 @@ public class LoadFaviconTask {
 
     private void processResult(Bitmap image) {
         Favicons.removeLoadTask(id);
-        Bitmap scaled = image;
+        final Bitmap scaled;
 
         // Notify listeners, scaling if required.
-        if (targetWidth != -1 && image != null &&  image.getWidth() != targetWidth) {
+        if ((flags & FLAG_BYPASS_CACHE_WHEN_DOWNLOADING_ICONS) != 0) {
+            scaled = Bitmap.createScaledBitmap(image, targetWidth, targetWidth, true);
+        } else if (targetWidth != -1 && image != null &&  image.getWidth() != targetWidth) {
             scaled = Favicons.getSizedFaviconFromCache(faviconURL, targetWidth);
+        } else {
+            scaled = image;
         }
 
         Favicons.dispatchResult(pageUrl, faviconURL, scaled, listener);
diff --git a/mobile/android/base/java/org/mozilla/gecko/home/TwoLinePageRow.java b/mobile/android/base/java/org/mozilla/gecko/home/TwoLinePageRow.java
index 2dd10f669a81..794482b09500 100644
--- a/mobile/android/base/java/org/mozilla/gecko/home/TwoLinePageRow.java
+++ b/mobile/android/base/java/org/mozilla/gecko/home/TwoLinePageRow.java
@@ -25,6 +25,7 @@ import android.text.TextUtils;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.LayoutInflater;
+import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
@@ -35,9 +36,9 @@ public class TwoLinePageRow extends LinearLayout
 
     private final TextView mTitle;
     private final TextView mUrl;
+    private final ImageView mStatusIcon;
 
     private int mSwitchToTabIconId;
-    private int mPageTypeIconId;
 
     private final FaviconView mFavicon;
 
@@ -90,11 +91,14 @@ public class TwoLinePageRow extends LinearLayout
         setGravity(Gravity.CENTER_VERTICAL);
 
         LayoutInflater.from(context).inflate(R.layout.two_line_page_row, this);
+        // Merge layouts lose their padding, so set it dynamically.
+        setPadding(0, 0, (int) getResources().getDimension(R.dimen.page_row_padding_right), 0);
+
         mTitle = (TextView) findViewById(R.id.title);
         mUrl = (TextView) findViewById(R.id.url);
+        mStatusIcon = (ImageView) findViewById(R.id.status_icon_bookmark);
 
         mSwitchToTabIconId = NO_ICON;
-        mPageTypeIconId = NO_ICON;
         mShowIcons = true;
 
         mFavicon = (FaviconView) findViewById(R.id.icon);
@@ -173,16 +177,12 @@ public class TwoLinePageRow extends LinearLayout
         }
 
         mSwitchToTabIconId = iconId;
-        mUrl.setCompoundDrawablesWithIntrinsicBounds(mSwitchToTabIconId, 0, mPageTypeIconId, 0);
+        mUrl.setCompoundDrawablesWithIntrinsicBounds(mSwitchToTabIconId, 0, 0, 0);
     }
 
-    private void setPageTypeIcon(int iconId) {
-        if (mPageTypeIconId == iconId) {
-            return;
-        }
-
-        mPageTypeIconId = iconId;
-        mUrl.setCompoundDrawablesWithIntrinsicBounds(mSwitchToTabIconId, 0, mPageTypeIconId, 0);
+    private void showBookmarkIcon(boolean toShow) {
+        final int visibility = toShow ? VISIBLE : GONE;
+        mStatusIcon.setVisibility(visibility);
     }
 
     /**
@@ -231,13 +231,10 @@ public class TwoLinePageRow extends LinearLayout
         if (mShowIcons) {
             // The bookmark id will be 0 (null in database) when the url
             // is not a bookmark.
-            if (bookmarkId == 0) {
-                setPageTypeIcon(NO_ICON);
-            } else {
-                setPageTypeIcon(R.drawable.ic_url_bar_star);
-            }
+            final boolean isBookmark = bookmarkId != 0;
+            showBookmarkIcon(isBookmark);
         } else {
-            setPageTypeIcon(NO_ICON);
+            showBookmarkIcon(false);
         }
 
         // Use the URL instead of an empty title for consistency with the normal URL
diff --git a/mobile/android/base/resources/drawable-hdpi/ic_url_bar_star.png b/mobile/android/base/resources/drawable-hdpi/ic_url_bar_star.png
deleted file mode 100644
index bf18ebeb035c..000000000000
Binary files a/mobile/android/base/resources/drawable-hdpi/ic_url_bar_star.png and /dev/null differ
diff --git a/mobile/android/base/resources/drawable-nodpi/bookmarked_star.png b/mobile/android/base/resources/drawable-nodpi/bookmarked_star.png
new file mode 100644
index 000000000000..641a0e1b5dc2
Binary files /dev/null and b/mobile/android/base/resources/drawable-nodpi/bookmarked_star.png differ
diff --git a/mobile/android/base/resources/drawable-xhdpi/ic_url_bar_star.png b/mobile/android/base/resources/drawable-xhdpi/ic_url_bar_star.png
deleted file mode 100644
index 5f6f96db027d..000000000000
Binary files a/mobile/android/base/resources/drawable-xhdpi/ic_url_bar_star.png and /dev/null differ
diff --git a/mobile/android/base/resources/layout/two_line_page_row.xml b/mobile/android/base/resources/layout/two_line_page_row.xml
index a36472ed677b..ce3792f02cdd 100644
--- a/mobile/android/base/resources/layout/two_line_page_row.xml
+++ b/mobile/android/base/resources/layout/two_line_page_row.xml
@@ -14,29 +14,38 @@
                                           android:layout_margin="16dp"
                                           tools:background="@drawable/favicon_globe"/>
 
-    <LinearLayout android:layout_width="match_parent"
+    <LinearLayout android:layout_width="0dp"
                   android:layout_height="wrap_content"
+                  android:layout_weight="1"
                   android:layout_gravity="center_vertical"
-                  android:orientation="vertical"
-                  android:paddingRight="25dp">
+                  android:paddingRight="10dp"
+                  android:orientation="vertical">
 
         <org.mozilla.gecko.widget.FadedSingleColorTextView
                 android:id="@+id/title"
                 style="@style/Widget.TwoLinePageRow.Title"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
-                gecko:fadeWidth="30dp"
+                gecko:fadeWidth="90dp"
                 tools:text="This is a long test title"/>
 
-        <TextView android:id="@+id/url"
+        <org.mozilla.gecko.widget.FadedSingleColorTextView android:id="@+id/url"
                   style="@style/Widget.TwoLinePageRow.Url"
                   android:layout_width="match_parent"
                   android:layout_height="wrap_content"
                   android:drawablePadding="5dp"
                   android:maxLength="1024"
+                  gecko:fadeWidth="90dp"
                   tools:text="http://test.com/test"
-                  tools:drawableLeft="@drawable/ic_url_bar_tab"
-                  tools:drawableRight="@drawable/ic_url_bar_star"/>
+                  tools:drawableLeft="@drawable/ic_url_bar_tab"/>
 
     </LinearLayout>
+
+    <ImageView android:id="@+id/status_icon_bookmark"
+               android:layout_width="20dp"
+               android:layout_height="20dp"
+               android:layout_gravity="center"
+               android:visibility="gone"
+               android:src="@drawable/bookmarked_star"/>
+
 </merge>
diff --git a/mobile/android/base/resources/values/dimens.xml b/mobile/android/base/resources/values/dimens.xml
index 63d6981bcd1f..676138347c03 100644
--- a/mobile/android/base/resources/values/dimens.xml
+++ b/mobile/android/base/resources/values/dimens.xml
@@ -79,6 +79,8 @@
     <dimen name="site_security_unknown_inset_top">1dp</dimen>
     <dimen name="site_security_unknown_inset_bottom">-1dp</dimen>
 
+    <dimen name="page_row_padding_right">15dp</dimen>
+
     <!-- Regular page row on about:home -->
     <dimen name="page_row_height">64dp</dimen>
 
diff --git a/mobile/android/base/resources/values/styles.xml b/mobile/android/base/resources/values/styles.xml
index 6d4522ed4a9a..bb6fce1d7dc4 100644
--- a/mobile/android/base/resources/values/styles.xml
+++ b/mobile/android/base/resources/values/styles.xml
@@ -126,7 +126,6 @@
         <item name="android:textAppearance">@style/TextAppearance.Widget.Home.ItemDescription</item>
         <item name="android:includeFontPadding">false</item>
         <item name="android:singleLine">true</item>
-        <item name="android:ellipsize">middle</item>
     </style>
 
     <style name="Widget.ReadingListRow" />
@@ -413,7 +412,9 @@
         <item name="android:textColor">?android:attr/textColorPrimary</item>
     </style>
 
-    <style name="TextAppearance.Widget.Home.ItemTitle" parent="TextAppearance.Medium"/>
+    <style name="TextAppearance.Widget.Home.ItemTitle" parent="TextAppearance">
+        <item name="android:textSize">16dp</item>
+    </style>
 
     <style name="TextAppearance.Widget.Home.ItemDescription" parent="TextAppearance.Micro">
         <item name="android:textColor">@color/tabs_tray_icon_grey</item>
diff --git a/mobile/android/chrome/content/ActionBarHandler.js b/mobile/android/chrome/content/ActionBarHandler.js
index 2081071c3a2c..97c158285909 100644
--- a/mobile/android/chrome/content/ActionBarHandler.js
+++ b/mobile/android/chrome/content/ActionBarHandler.js
@@ -63,8 +63,9 @@ var ActionBarHandler = {
 
     // Else, update an open ActionBar.
     if (this._selectionID) {
-      if ([this._targetElement, this._contentWindow] ===
-          [Services.focus.focusedElement, Services.focus.focusedWindow]) {
+      let [element, win] = this._getSelectionTargets();
+      if (this._targetElement === element &&
+          this._contentWindow === win) {
         // We have the same focused window/element as before. Trigger "TextSelection:ActionbarStatus"
         // message only if available actions differ from when last we checked.
         this._sendActionBarActions();
@@ -225,8 +226,14 @@ var ActionBarHandler = {
    */
   _sendActionBarActions: function(sendAlways) {
     let actions = this._getActionBarActions();
+    let actionCountUnchanged = this._actionBarActions &&
+      actions.length === this._actionBarActions.length;
+    let actionsMatch = actionCountUnchanged &&
+      this._actionBarActions.every((e,i) => {
+        return e.id === actions[i].id;
+      });
 
-    if (sendAlways || actions !== this._actionBarActions) {
+    if (sendAlways || !actionsMatch) {
       Messaging.sendRequest({
         type: "TextSelection:ActionbarStatus",
         actions: actions,
diff --git a/services/sync/modules/SyncedTabs.jsm b/services/sync/modules/SyncedTabs.jsm
index 3eea56bc6461..9c790711c904 100644
--- a/services/sync/modules/SyncedTabs.jsm
+++ b/services/sync/modules/SyncedTabs.jsm
@@ -208,6 +208,9 @@ let SyncedTabsInternal = {
         Preferences.reset("services.sync.lastTabFetch");
         Services.obs.notifyObservers(null, TOPIC_TABS_CHANGED, null);
         break;
+      case "nsPref:changed":
+        Services.obs.notifyObservers(null, TOPIC_TABS_CHANGED, null);
+        break;
       default:
         break;
     }
@@ -232,6 +235,10 @@ let SyncedTabsInternal = {
 
 Services.obs.addObserver(SyncedTabsInternal, "weave:engine:sync:finish", false);
 Services.obs.addObserver(SyncedTabsInternal, "weave:service:start-over", false);
+// Observe the pref the indicates the state of the tabs engine has changed.
+// This will force consumers to re-evaluate the state of sync and update
+// accordingly.
+Services.prefs.addObserver("services.sync.engine.tabs", SyncedTabsInternal, false);
 
 // The public interface.
 this.SyncedTabs = {
diff --git a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
index 73c7cd6e4057..b7788372d70e 100644
--- a/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
+++ b/testing/mochitest/BrowserTestUtils/BrowserTestUtils.jsm
@@ -591,6 +591,27 @@ this.BrowserTestUtils = {
     });
   },
 
+  /**
+   * Wait for a message to be fired from a particular message manager
+   *
+   * @param {nsIMessageManager} messageManager
+   *                            The message manager that should be used.
+   * @param {String}            message
+   *                            The message we're waiting for.
+   * @param {Function}          checkFn (optional)
+   *                            Optional function to invoke to check the message.
+   */
+  waitForMessage(messageManager, message, checkFn) {
+    return new Promise(resolve => {
+      messageManager.addMessageListener(message, function onMessage(msg) {
+        if (!checkFn || checkFn(msg)) {
+          messageManager.removeMessageListener(message, onMessage);
+          resolve();
+        }
+      });
+    });
+  },
+
   /**
    *  Version of synthesizeMouse that uses the center of the target as the mouse
    *  location. Arguments and the return value are the same.
diff --git a/toolkit/components/telemetry/Histograms.json b/toolkit/components/telemetry/Histograms.json
index 82e782051a81..185f50d6748f 100644
--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -7021,6 +7021,20 @@
     "description": "Number of times a custom developer tool has been opened.",
     "releaseChannelCollection": "opt-out"
   },
+  "DEVTOOLS_RELOAD_ADDON_INSTALLED_COUNT": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "55",
+    "kind": "count",
+    "description": "Number of times the reload addon has been installed.",
+    "bug_numbers": [1248435]
+  },
+  "DEVTOOLS_RELOAD_ADDON_RELOAD_COUNT": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "55",
+    "kind": "count",
+    "description": "Number of times the tools have been reloaded by the reload addon.",
+    "bug_numbers": [1248435]
+  },
   "DEVTOOLS_TOOLBOX_OPENED_PER_USER_FLAG": {
     "expires_in_version": "never",
     "kind": "flag",
@@ -7204,6 +7218,20 @@
     "kind": "flag",
     "description": "Number of users that have opened a custom developer tool via the toolbox button."
   },
+  "DEVTOOLS_RELOAD_ADDON_INSTALLED_PER_USER_FLAG": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "55",
+    "kind": "flag",
+    "description": "Records once per browser version if the reload add-on is installed.",
+    "bug_numbers": [1248435]
+  },
+  "DEVTOOLS_RELOAD_ADDON_RELOAD_PER_USER_FLAG": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "55",
+    "kind": "flag",
+    "description": "Records once per browser version if the tools have been reloaded via the reload add-on.",
+    "bug_numbers": [1248435]
+  },
   "DEVTOOLS_TOOLBOX_TIME_ACTIVE_SECONDS": {
     "expires_in_version": "never",
     "kind": "exponential",
@@ -8452,6 +8480,15 @@
     "releaseChannelCollection": "opt-out",
     "description": "Number of sessions where at least one chat message was exchanged"
   },
+  "LOOP_INFOBAR_ACTION_BUTTONS": {
+    "alert_emails": ["firefox-dev@mozilla.org", "mbanner@mozilla.com"],
+    "expires_in_version": "51",
+    "kind": "enumerated",
+    "n_values": 4,
+    "releaseChannelCollection": "opt-out",
+    "bug_numbers": [1245486],
+    "description": "Number times info bar buttons are clicked (0=PAUSED, 1=CREATED)"
+  },
   "E10S_STATUS": {
     "alert_emails": ["firefox-dev@mozilla.org"],
     "expires_in_version": "never",
diff --git a/toolkit/components/url-classifier/tests/mochitest/classifierCommon.js b/toolkit/components/url-classifier/tests/mochitest/classifierCommon.js
new file mode 100644
index 000000000000..00e45ecb8a71
--- /dev/null
+++ b/toolkit/components/url-classifier/tests/mochitest/classifierCommon.js
@@ -0,0 +1,38 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function doUpdate(update) {
+  const { classes: Cc, interfaces: Ci, results: Cr } = Components;
+
+  let listener = {
+    QueryInterface: function(iid)
+    {
+      if (iid.equals(Ci.nsISupports) ||
+          iid.equals(Ci.nsIUrlClassifierUpdateObserver))
+        return this;
+
+      throw Cr.NS_ERROR_NO_INTERFACE;
+    },
+    updateUrlRequested: function(url) { },
+    streamFinished: function(status) { },
+    updateError: function(errorCode) {
+      sendAsyncMessage("updateError", { errorCode });
+    },
+    updateSuccess: function(requestedTimeout) {
+      sendAsyncMessage("loadTestFrame");
+    }
+  };
+
+  let dbService = Cc["@mozilla.org/url-classifier/dbservice;1"]
+                  .getService(Ci.nsIUrlClassifierDBService);
+
+  dbService.beginUpdate(listener, "test-malware-simple,test-unwanted-simple", "");
+  dbService.beginStream("", "");
+  dbService.updateStream(update);
+  dbService.finishStream();
+  dbService.finishUpdate();
+}
+
+addMessageListener("doUpdate", ({ testUpdate }) => {
+  doUpdate(testUpdate);
+});
diff --git a/toolkit/components/url-classifier/tests/mochitest/mochitest.ini b/toolkit/components/url-classifier/tests/mochitest/mochitest.ini
index d9356a5477f3..55af28453e54 100644
--- a/toolkit/components/url-classifier/tests/mochitest/mochitest.ini
+++ b/toolkit/components/url-classifier/tests/mochitest/mochitest.ini
@@ -1,7 +1,8 @@
 [DEFAULT]
-skip-if = buildapp == 'b2g' || e10s
+skip-if = buildapp == 'b2g'
 support-files =
   classifiedAnnotatedPBFrame.html
+  classifierCommon.js
   classifierFrame.html
   cleanWorker.js
   good.js
diff --git a/toolkit/components/url-classifier/tests/mochitest/test_classifier.html b/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
index 374271addb60..2ea5bfeb5e92 100644
--- a/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
+++ b/toolkit/components/url-classifier/tests/mochitest/test_classifier.html
@@ -13,8 +13,6 @@
 
 <script class="testbody" type="text/javascript">
 
-var Cc = SpecialPowers.Cc;
-var Ci = SpecialPowers.Ci;
 var firstLoad = true;
 
 // Add some URLs to the malware database.
@@ -30,51 +28,33 @@ testUpdate +=
   "a:524:32:" + testData.length + "\n" +
   testData;
 
-var dbService = Cc["@mozilla.org/url-classifier/dbservice;1"]
-                .getService(Ci.nsIUrlClassifierDBService);
-
 function loadTestFrame() {
   document.getElementById("testFrame").src = "classifierFrame.html";
 }
 
-function doUpdate(update) {
-  var listener = {
-    QueryInterface: SpecialPowers.wrapCallback(function(iid)
-    {
-      if (iid.equals(Ci.nsISupports) ||
-          iid.equals(Ci.nsIUrlClassifierUpdateObserver))
-        return this;
+const CLASSIFIER_COMMON_URL = SimpleTest.getTestFileURL("classifierCommon.js");
+let classifierCommonScript = SpecialPowers.loadChromeScript(CLASSIFIER_COMMON_URL);
 
-      throw Cr.NS_ERROR_NO_INTERFACE;
-    }),
-    updateUrlRequested: function(url) { },
-    streamFinished: function(status) { },
-    updateError: function(errorCode) {
-      ok(false, "Couldn't update classifier.");
-      // Abort test.
-      SimpleTest.finish();
-    },
-    updateSuccess: function(requestedTimeout) {
-      SpecialPowers.pushPrefEnv(
-        {"set" : [["browser.safebrowsing.malware.enabled", true]]},
-        loadTestFrame);
-    }
-  };
+// Expected finish() call is in "classifierFrame.html".
+SimpleTest.waitForExplicitFinish();
 
-  dbService.beginUpdate(listener, "test-malware-simple,test-unwanted-simple", "");
-  dbService.beginStream("", "");
-  dbService.updateStream(update);
-  dbService.finishStream();
-  dbService.finishUpdate();
-}
+classifierCommonScript.addMessageListener("loadTestFrame", () => {
+  SpecialPowers.pushPrefEnv(
+    {"set" : [["browser.safebrowsing.malware.enabled", true]]},
+    loadTestFrame);
+});
+classifierCommonScript.addMessageListener("updateError", ({ errorCode }) => {
+  ok(false, "Couldn't update classifier. Error code: " + errorCode);
+  // Abort test.
+  SimpleTest.finish();
+});
 
 SpecialPowers.pushPrefEnv(
   {"set" : [["urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple"],
             ["urlclassifier.phishTable", "test-phish-simple"]]},
-  function() { doUpdate(testUpdate); });
-
-// Expected finish() call is in "classifierFrame.html".
-SimpleTest.waitForExplicitFinish();
+  function() {
+    classifierCommonScript.sendAsyncMessage("doUpdate", { testUpdate });
+  });
 
 </script>
 
diff --git a/toolkit/components/url-classifier/tests/mochitest/test_classifier_worker.html b/toolkit/components/url-classifier/tests/mochitest/test_classifier_worker.html
index d74f2802521f..954d674715f4 100644
--- a/toolkit/components/url-classifier/tests/mochitest/test_classifier_worker.html
+++ b/toolkit/components/url-classifier/tests/mochitest/test_classifier_worker.html
@@ -13,9 +13,6 @@
 
 <script class="testbody" type="text/javascript">
 
-var Cc = SpecialPowers.Cc;
-var Ci = SpecialPowers.Ci;
-
 // Add some URLs to the malware database.
 var testData = "example.com/tests/toolkit/components/url-classifier/tests/mochitest/evilWorker.js";
 var testUpdate =
@@ -29,42 +26,9 @@ testUpdate +=
   "a:550:32:" + testData.length + "\n" +
   testData;
 
-var dbService = Cc["@mozilla.org/url-classifier/dbservice;1"]
-                .getService(Ci.nsIUrlClassifierDBService);
-
-function doUpdate(update) {
-  var listener = {
-    QueryInterface: SpecialPowers.wrapCallback(function(iid)
-    {
-      if (iid.equals(Ci.nsISupports) ||
-          iid.equals(Ci.nsIUrlClassifierUpdateObserver))
-        return this;
-
-      throw Cr.NS_ERROR_NO_INTERFACE;
-    }),
-    updateUrlRequested: function(url) { },
-    streamFinished: function(status) { },
-    updateError: function(errorCode) {
-      ok(false, "Couldn't update classifier.");
-      // Abort test.
-      SimpleTest.finish();
-    },
-    updateSuccess: function(requestedTimeout) {
-      SpecialPowers.pushPrefEnv(
-        {"set" : [["browser.safebrowsing.malware.enabled", true]]},
-        function loadTestFrame() {
-          document.getElementById("testFrame").src =
-            "http://example.com/tests/toolkit/components/url-classifier/tests/mochitest/workerFrame.html";
-        }
-      );
-    }
-  };
-
-  dbService.beginUpdate(listener, "test-malware-simple,test-unwanted-simple", "");
-  dbService.beginStream("", "");
-  dbService.updateStream(update);
-  dbService.finishStream();
-  dbService.finishUpdate();
+function loadTestFrame() {
+  document.getElementById("testFrame").src =
+    "http://example.com/tests/toolkit/components/url-classifier/tests/mochitest/workerFrame.html";
 }
 
 function onmessage(event)
@@ -78,10 +42,26 @@ function onmessage(event)
   is(pieces[0], "success", pieces[1]);
 }
 
+const CLASSIFIER_COMMON_URL = SimpleTest.getTestFileURL("classifierCommon.js");
+let classifierCommonScript = SpecialPowers.loadChromeScript(CLASSIFIER_COMMON_URL);
+
+classifierCommonScript.addMessageListener("loadTestFrame", () => {
+  SpecialPowers.pushPrefEnv(
+    {"set" : [["browser.safebrowsing.malware.enabled", true]]},
+    loadTestFrame);
+});
+classifierCommonScript.addMessageListener("updateError", ({ errorCode }) => {
+  ok(false, "Couldn't update classifier. Error code: " + errorCode);
+  // Abort test.
+  SimpleTest.finish();
+});
+
 SpecialPowers.pushPrefEnv(
   {"set" : [["urlclassifier.malwareTable", "test-malware-simple,test-unwanted-simple"],
             ["urlclassifier.phishTable", "test-phish-simple"]]},
-  function() { doUpdate(testUpdate); });
+  function() {
+    classifierCommonScript.sendAsyncMessage("doUpdate", { testUpdate });
+  });
 
 window.addEventListener("message", onmessage, false);
 
diff --git a/uriloader/exthandler/tests/mochitest/mochitest.ini b/uriloader/exthandler/tests/mochitest/mochitest.ini
index f1798989bf7f..000752f57140 100644
--- a/uriloader/exthandler/tests/mochitest/mochitest.ini
+++ b/uriloader/exthandler/tests/mochitest/mochitest.ini
@@ -3,10 +3,10 @@ skip-if = buildapp == 'b2g'
 support-files =
   handlerApp.xhtml
   handlerApps.js
+  unsafeBidi_chromeScript.js
   unsafeBidiFileName.sjs
 
 [test_badMimeType.html]
 [test_handlerApps.xhtml]
 skip-if = (toolkit == 'android' || os == 'mac') || e10s # OS X: bug 786938
 [test_unsafeBidiChars.xhtml]
-skip-if = e10s
diff --git a/uriloader/exthandler/tests/mochitest/test_unsafeBidiChars.xhtml b/uriloader/exthandler/tests/mochitest/test_unsafeBidiChars.xhtml
index 3e5fa41c82e5..fafe0b4c56e2 100644
--- a/uriloader/exthandler/tests/mochitest/test_unsafeBidiChars.xhtml
+++ b/uriloader/exthandler/tests/mochitest/test_unsafeBidiChars.xhtml
@@ -2,21 +2,22 @@
 <head>
   <title>Test for Handling of unsafe bidi chars</title>
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
-<body onload="load();">
+<body>
 <p id="display"></p>
 <iframe id="test"></iframe>
 <script type="text/javascript">
 <![CDATA[
 
-var unsafeBidiChars = {
-  LRE: "\xe2\x80\xaa",
-  RLE: "\xe2\x80\xab",
-  PDF: "\xe2\x80\xac",
-  LRO: "\xe2\x80\xad",
-  RLO: "\xe2\x80\xae"
-};
+var unsafeBidiChars = [
+  "\xe2\x80\xaa", // LRE
+  "\xe2\x80\xab", // RLE
+  "\xe2\x80\xac", // PDF
+  "\xe2\x80\xad", // LRO
+  "\xe2\x80\xae"  // RLO
+];
 
 var tests = [
   "{1}.test",
@@ -37,100 +38,40 @@ function sanitize(name) {
   return replace(name, '_');
 }
 
-var gTests = [];
-function make_test(param, expected) {
-  gTests.push({
-    param: param,
-    expected: expected,
+add_task(function* () {
+  let url = SimpleTest.getTestFileURL("unsafeBidi_chromeScript.js");
+  let chromeScript = SpecialPowers.loadChromeScript(url);
+
+  for (let test of tests) {
+    for (let char of unsafeBidiChars) {
+      let promiseName = new Promise(function(resolve) {
+        chromeScript.addMessageListener("suggestedFileName",
+                                        function listener(data) {
+          chromeScript.removeMessageListener("suggestedFileName", listener);
+          resolve(data);
+        });
+      });
+      let name = replace(test, char);
+      let expected = sanitize(test);
+      document.getElementById("test").src =
+        "unsafeBidiFileName.sjs?name=" + encodeURIComponent(name);
+      is((yield promiseName), expected, "got the expected sanitized name");
+    }
+  }
+
+  let promise = new Promise(function(resolve) {
+    chromeScript.addMessageListener("unregistered", function listener() {
+      chromeScript.removeMessageListener("unregistered", listener);
+      resolve();
+    });
   });
-}
+  chromeScript.sendAsyncMessage("unregister");
+  yield promise;
 
-SimpleTest.waitForExplicitFinish();
-
-function load() {
-  var iframe = document.getElementById("test");
-  var gCallback = null;
-  function run_test(test, cb) {
-    var url = "unsafeBidiFileName.sjs?name=" + encodeURIComponent(test.param);
-    gCallback = cb;
-    iframe.src = url;
-  }
-
-  var gCounter = -1;
-  function run_next_test() {
-    if (++gCounter == gTests.length)
-      finish_test();
-    else
-      run_test(gTests[gCounter], run_next_test);
-  }
-
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-
-  const HELPERAPP_DIALOG_CONTRACT = "@mozilla.org/helperapplauncherdialog;1";
-  const HELPERAPP_DIALOG_CID = SpecialPowers.wrap(SpecialPowers.Components).ID(SpecialPowers.Cc[HELPERAPP_DIALOG_CONTRACT].number);
-
-  const FAKE_CID = SpecialPowers.Cc["@mozilla.org/uuid-generator;1"].
-    getService(SpecialPowers.Ci.nsIUUIDGenerator).generateUUID();
-
-  function HelperAppLauncherDialog() {}
-  HelperAppLauncherDialog.prototype = {
-    REASON_CANTHANDLE: 0,
-    REASON_SERVERREQUEST: 1,
-    REASON_TYPESNIFFED: 2,
-    show: function(aLauncher, aWindowContext, aReason) {
-      netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-      var test = gTests[gCounter];
-      is(aLauncher.suggestedFileName, test.expected,
-         "The filename should be correctly sanitized");
-      gCallback();
-    },
-    QueryInterface: function(aIID) {
-      netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-      if (aIID.equals(SpecialPowers.Ci.nsISupports) ||
-          aIID.equals(SpecialPowers.Ci.nsIHelperAppLauncherDialog))
-        return this;
-      throw SpecialPowers.Cr.NS_ERROR_NO_INTERFACE;
-    }
-  };
-
-  var factory = {
-    createInstance: function(aOuter, aIID) {
-      netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-      if (aOuter != null)
-        throw SpecialPowers.Cr.NS_ERROR_NO_AGGREGATION;
-      return new HelperAppLauncherDialog().QueryInterface(aIID);
-    }
-  };
-
-  SpecialPowers.wrap(SpecialPowers.Components).manager
-            .QueryInterface(SpecialPowers.Ci.nsIComponentRegistrar)
-            .registerFactory(FAKE_CID, "",
-                             HELPERAPP_DIALOG_CONTRACT,
-                             factory);
-
-  function finish_test() {
-    SpecialPowers.wrap(SpecialPowers.Components).manager
-              .QueryInterface(SpecialPowers.Ci.nsIComponentRegistrar)
-              .registerFactory(HELPERAPP_DIALOG_CID, "",
-                               HELPERAPP_DIALOG_CONTRACT,
-                               null);
-    SimpleTest.finish();
-  }
-
-  var i,j;
-
-  for (i = 0; i < tests.length; ++i) {
-    for (j in unsafeBidiChars) {
-      make_test(replace(tests[i], unsafeBidiChars[j]),
-                sanitize(tests[i]));
-    }
-  }
-
-  run_next_test();
-}
+  chromeScript.destroy();
+});
 
 ]]>
 </script>
 </body>
 </html>
-
diff --git a/uriloader/exthandler/tests/mochitest/unsafeBidi_chromeScript.js b/uriloader/exthandler/tests/mochitest/unsafeBidi_chromeScript.js
new file mode 100644
index 000000000000..16c82d818e66
--- /dev/null
+++ b/uriloader/exthandler/tests/mochitest/unsafeBidi_chromeScript.js
@@ -0,0 +1,28 @@
+const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+const HELPERAPP_DIALOG_CONTRACT = "@mozilla.org/helperapplauncherdialog;1";
+const HELPERAPP_DIALOG_CID =
+  Components.ID(Cc[HELPERAPP_DIALOG_CONTRACT].number);
+
+const FAKE_CID = Cc["@mozilla.org/uuid-generator;1"].
+                   getService(Ci.nsIUUIDGenerator).generateUUID();
+
+function HelperAppLauncherDialog() {}
+HelperAppLauncherDialog.prototype = {
+  show: function(aLauncher, aWindowContext, aReason) {
+    sendAsyncMessage("suggestedFileName", aLauncher.suggestedFileName);
+  },
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIHelperAppLauncherDialog])
+};
+
+var registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+registrar.registerFactory(FAKE_CID, "", HELPERAPP_DIALOG_CONTRACT,
+                          XPCOMUtils._getFactory(HelperAppLauncherDialog));
+
+addMessageListener("unregister", function() {
+  registrar.registerFactory(HELPERAPP_DIALOG_CID, "",
+                            HELPERAPP_DIALOG_CONTRACT, null);
+  sendAsyncMessage("unregistered");
+});