diff --git a/dom/apps/tests/file_manifest.json b/dom/apps/tests/file_manifest.json
index 42a3f553fda8..1569a1efe691 100644
--- a/dom/apps/tests/file_manifest.json
+++ b/dom/apps/tests/file_manifest.json
@@ -1,19 +1,13 @@
 {
   "name": "My W3C Web App",
   "short_name": "My App",
-  "icons": {
-    "15": "/tests/dom/apps/tests/icon15.png",
-    "48": "/tests/dom/apps/tests/icon48.png"
-  },
-  "start_url": "/index.html",
-  "display": "standalone",
-  "entry_points": {
-    "ep1": {
-      "name": "This is an entry point",
-      "icons": {
-        "15": "/tests/dom/apps/tests/icon15alternate.png",
-        "48": "/tests/dom/apps/tests/icon48.png"
-      }
+  "icons": [
+    {
+      "src": "/favicon.ico",
+      "sizes": "64x64",
+      "type": "image/png"
     }
-  }
-}
+  ],
+  "start_url": "/index.html",
+  "display": "standalone"
+}
\ No newline at end of file
diff --git a/dom/apps/tests/file_packaged_app.sjs b/dom/apps/tests/file_packaged_app.sjs
index 4bda60a7fe10..788ff22b85f0 100644
--- a/dom/apps/tests/file_packaged_app.sjs
+++ b/dom/apps/tests/file_packaged_app.sjs
@@ -17,13 +17,6 @@ var gAppName = "appname";
 var gDevName = "devname";
 var gDevUrl = "http://dev.url";
 
-var gIconData =
-"iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAMAAAAMCGV4AAAABGdBTUEAANbY1E9YMgAAABl0RVh0" +
-"U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAA5UExURbVCQs6UlM6EhJwhIa0hIc5zc5wQ" +
-"EL1SUu/W1rVjY6UQELUAAOfGxue1tZwAAIwAAP///3sAAK0AAOytg2MAAABmSURBVHjabIkLEsJA" +
-"CEOz249aIUDvf1ihVWe208ADQvDeh8I+6s7zSw0wJ6vPA5z7o+u8LbrUD4SXnkln5XSHJnAhDWau" +
-"tia1jeXlz7SeeRy5TC6wkBaWhLZoL4RF9Q/EqKv/CDAAFpEM3avxBREAAAAASUVORK5CYII=";
-
 function handleRequest(request, response) {
   var query = getQuery(request);
 
@@ -94,9 +87,6 @@ function handleRequest(request, response) {
                              appName, devName, devUrl);
       addZipEntry(zipWriter, app, "index.html");
 
-      var iconString = atob(gIconData);
-      addZipEntry(zipWriter, iconString, "icon.png");
-
       zipWriter.close();
     }
 
diff --git a/dom/apps/tests/file_packaged_app.template.webapp b/dom/apps/tests/file_packaged_app.template.webapp
index 14510b36b3f6..6d4bc0c7480f 100644
--- a/dom/apps/tests/file_packaged_app.template.webapp
+++ b/dom/apps/tests/file_packaged_app.template.webapp
@@ -12,9 +12,6 @@
      "downloads": {}
    },
   "launch_path": "tests/dom/apps/tests/file_packaged_app.sjs",
-  "icons": {
-    "15": "icon.png"
-  },
   "developer": {
     "name": "DEVELOPERTOKEN",
     "url": "DEVELOPERURLTOKEN"
diff --git a/dom/apps/tests/icon15.png b/dom/apps/tests/icon15.png
deleted file mode 100644
index f752986b7e13..000000000000
Binary files a/dom/apps/tests/icon15.png and /dev/null differ
diff --git a/dom/apps/tests/icon15alternate.png b/dom/apps/tests/icon15alternate.png
deleted file mode 100644
index a85552b240fb..000000000000
Binary files a/dom/apps/tests/icon15alternate.png and /dev/null differ
diff --git a/dom/apps/tests/icon48.png b/dom/apps/tests/icon48.png
deleted file mode 100644
index c4307fc84184..000000000000
Binary files a/dom/apps/tests/icon48.png and /dev/null differ
diff --git a/dom/apps/tests/mochitest.ini b/dom/apps/tests/mochitest.ini
index 793675e2b8ee..798a32bd9617 100644
--- a/dom/apps/tests/mochitest.ini
+++ b/dom/apps/tests/mochitest.ini
@@ -28,9 +28,6 @@ support-files =
   test_packaged_app_common.js
   marketplace/*
   pkg_install_iframe.html
-  icon15.png
-  icon15alternate.png
-  icon48.png
 
 [test_app_addons.html]
 skip-if = os == "android" || toolkit == "gonk" # embed-apps doesn't work in mochitest app
diff --git a/dom/apps/tests/test_packaged_app_install.html b/dom/apps/tests/test_packaged_app_install.html
index 3065b3e77be0..1eca12f8bfb5 100644
--- a/dom/apps/tests/test_packaged_app_install.html
+++ b/dom/apps/tests/test_packaged_app_install.html
@@ -76,15 +76,6 @@ function checkInstalledApp(aMiniManifestURL,
   };
 }
 
-var gIconData =
-"iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAMAAAAMCGV4AAAABGdBTUEAANbY1E9YMgAAABl0RVh0" +
-"U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAA5UExURbVCQs6UlM6EhJwhIa0hIc5zc5wQ" +
-"EL1SUu/W1rVjY6UQELUAAOfGxue1tZwAAIwAAP///3sAAK0AAOytg2MAAABmSURBVHjabIkLEsJA" +
-"CEOz249aIUDvf1ihVWe208ADQvDeh8I+6s7zSw0wJ6vPA5z7o+u8LbrUD4SXnkln5XSHJnAhDWau" +
-"tia1jeXlz7SeeRy5TC6wkBaWhLZoL4RF9Q/EqKv/CDAAFpEM3avxBREAAAAASUVORK5CYII=";
-
-var gIconSize = 15;
-
 SimpleTest.waitForExplicitFinish();
 SimpleTest.requestFlakyTimeout("untriaged");
 
@@ -204,7 +195,6 @@ var steps = [
     info("== TEST == Install packaged app");
     var miniManifestURL = PackagedTestHelper.gSJS +
                           "?getManifest=true";
-
     navigator.mozApps.mgmt.oninstall = function(evt) {
       info("Got oninstall event");
       PackagedTestHelper.gApp = evt.application;
@@ -241,25 +231,6 @@ var steps = [
   function() {
     PackagedTestHelper.setAppVersion(3, PackagedTestHelper.next, false, true);
   },
-  function() {
-    info("== TEST == Get icon");
-    var app = PackagedTestHelper.gApp;
-
-    navigator.mozApps.mgmt.getIcon(app, gIconSize).then((blob) => {
-      var reader = new FileReader();
-
-      reader.onloadend = function() {
-        var success = btoa(reader.result) == gIconData;
-        ok(success, "== TEST == Icon matches expected icon");
-        PackagedTestHelper.next();
-      }
-
-      reader.readAsBinaryString(blob);
-    }, (err) => {
-      ok(false, "Can't get icon: " + err);
-      PackagedTestHelper.finish();
-    });
-  },
   function() {
     info("== TEST == Install packaged app with a cancel/resume");
     var miniManifestURL = PackagedTestHelper.gSJS +
diff --git a/dom/apps/tests/test_web_app_install.html b/dom/apps/tests/test_web_app_install.html
index 071aecb25301..c57f08b5e8ef 100644
--- a/dom/apps/tests/test_web_app_install.html
+++ b/dom/apps/tests/test_web_app_install.html
@@ -19,19 +19,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id={1075716}
 <pre id="test">
 <script class="testbody" type="application/javascript;version=1.7">
 
-var gIconData =
-"iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAMAAAAMCGV4AAAABGdBTUEAANbY1E9YMgAAABl0RVh0" +
-"U29mdHdhcmUAQWRvYmUgSW1hZ2VSZWFkeXHJZTwAAAA5UExURbVCQs6UlM6EhJwhIa0hIc5zc5wQ" +
-"EL1SUu/W1rVjY6UQELUAAOfGxue1tZwAAIwAAP///3sAAK0AAOytg2MAAABmSURBVHjabIkLEsJA" +
-"CEOz249aIUDvf1ihVWe208ADQvDeh8I+6s7zSw0wJ6vPA5z7o+u8LbrUD4SXnkln5XSHJnAhDWau" +
-"tia1jeXlz7SeeRy5TC6wkBaWhLZoL4RF9Q/EqKv/CDAAFpEM3avxBREAAAAASUVORK5CYII=";
-
-var gAlternateIconData =
-"iVBORw0KGgoAAAANSUhEUgAAAA8AAAAPCAIAAAC0tAIdAAAAp0lEQVQoFWNklZ3AQDRgIlolSOFQ" +
-"Vc0C8eWvR/nI3n1544a4hgZEZG9nm+dUbggbxZcLfFxv79wGlAAqBbKBCMhWcnCCKAWSULOBLKC6" +
-"W9ePPM+/VHnjJYQNUfTnwzu4aoTZLAJCQNHPvz8BSQgbogiFDdcHMePD779AEWTzIAqAHrt/8gTU" +
-"JUDWs/sPgEoFWJnhbKA6oJOA4kDGwRnTHl88zzho0gkAc2hLRzn46hoAAAAASUVORK5CYII=";
-
 var gGenerator = runTest();
 
 function go() {
@@ -58,20 +45,6 @@ function cbError(aEvent) {
   finish();
 }
 
-function iconTest(app, iconSize, entryPoint, testFunction) {
-  navigator.mozApps.mgmt.getIcon(app, iconSize, entryPoint).then((blob) => {
-    var reader = new FileReader();
-    reader.onloadend = function() {
-      testFunction(reader.result);
-      continueTest();
-    }
-    reader.readAsBinaryString(blob);
-  }, (err) => {
-    ok(false, "Couldn't get icon.");
-    finish();
-  });
-}
-
 SimpleTest.waitForExplicitFinish();
 
 /**
@@ -104,30 +77,6 @@ function runTest() {
   ok(app, "App is non-null");
   is(app.manifestURL, manifestURL, "App manifest url is correct.");
 
-  info("Fetching 15x15 icon");
-  iconTest(app, 15, undefined, (iconData) => {
-    is(btoa(iconData), gIconData, "Fetches 15x15 icon successfully.")
-  });
-  yield undefined;
-
-  info("Fetching 48x48 icon");
-  iconTest(app, 48, "ep1", (iconData) => {
-    ok(iconData.length == 4762, "Fetches 48x48 icon successfully.")
-  });
-  yield undefined;
-
-  info("Fetching 30x30 icon");
-  iconTest(app, 30, undefined, (iconData) => {
-    is(btoa(iconData), gIconData, "Fetches 15x15 icon as best fit for 30x30.")
-  });
-  yield undefined;
-
-  info("Fetching entry-point icon");
-  iconTest(app, 15, "ep1", (iconData) => {
-    is(btoa(iconData), gAlternateIconData, "Entry-point Icon fetched successfully.")
-  });
-  yield undefined;
-
   request = navigator.mozApps.mgmt.uninstall(app);
   request.onerror = cbError;
   request.onsuccess = continueTest;
diff --git a/dom/tests/mochitest/webapps/test_list_api.xul b/dom/tests/mochitest/webapps/test_list_api.xul
index f06e90dd0c8a..f5a4c9ee86af 100644
--- a/dom/tests/mochitest/webapps/test_list_api.xul
+++ b/dom/tests/mochitest/webapps/test_list_api.xul
@@ -40,7 +40,6 @@ var mgmtProps = {
   dispatchEvent: "function",
   getEventHandler: "function",
   getAll: "function",
-  getIcon: "function",
   getNotInstalled: "function",
   uninstall: "function",
   oninstall: "object",
diff --git a/netwerk/test/httpserver/httpd.js b/netwerk/test/httpserver/httpd.js
index c72e47f50b8d..21d725280ec3 100644
--- a/netwerk/test/httpserver/httpd.js
+++ b/netwerk/test/httpserver/httpd.js
@@ -2741,8 +2741,6 @@ ServerHandler.prototype =
         var sis = new ScriptableInputStream(fis);
         var s = Cu.Sandbox(gGlobalObject);
         s.importFunction(dump, "dump");
-        s.importFunction(atob, "atob");
-        s.importFunction(btoa, "btoa");
 
         // Define a basic key-value state-preservation API across requests, with
         // keys initially corresponding to the empty string.