diff --git a/browser/base/content/test/general/browser.ini b/browser/base/content/test/general/browser.ini
index 577334c749e0..5231098d7903 100644
--- a/browser/base/content/test/general/browser.ini
+++ b/browser/base/content/test/general/browser.ini
@@ -392,7 +392,6 @@ support-files =
   contentSearchUI.html
   contentSearchUI.js
 [browser_selectpopup.js]
-run-if = e10s
 [browser_selectTabAtIndex.js]
 [browser_ssl_error_reports.js]
 [browser_star_hsts.js]
diff --git a/browser/base/content/test/general/browser_selectpopup.js b/browser/base/content/test/general/browser_selectpopup.js
index 6918b6c34036..40777581fd96 100644
--- a/browser/base/content/test/general/browser_selectpopup.js
+++ b/browser/base/content/test/general/browser_selectpopup.js
@@ -195,6 +195,14 @@ function* doSelectTests(contentType, dtd) {
   yield BrowserTestUtils.removeTab(tab);
 }
 
+add_task(function* setup() {
+  yield SpecialPowers.pushPrefEnv({
+    "set": [
+      ["dom.select_popup_in_parent.enabled", true],
+    ]
+  });
+});
+
 add_task(function*() {
   yield doSelectTests("text/html", "");
 });
diff --git a/layout/forms/nsListControlFrame.cpp b/layout/forms/nsListControlFrame.cpp
index 7f4f742228ec..47603ab2026b 100644
--- a/layout/forms/nsListControlFrame.cpp
+++ b/layout/forms/nsListControlFrame.cpp
@@ -118,6 +118,12 @@ nsListControlFrame::~nsListControlFrame()
   mComboboxFrame = nullptr;
 }
 
+static bool ShouldFireDropDownEvent() {
+  return (XRE_IsContentProcess() &&
+          Preferences::GetBool("browser.tabs.remote.desktopbehavior", false)) ||
+         Preferences::GetBool("dom.select_popup_in_parent.enabled", false);
+}
+
 // for Bug 47302 (remove this comment later)
 void
 nsListControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
@@ -141,8 +147,7 @@ nsListControlFrame::DestroyFrom(nsIFrame* aDestructRoot)
   mContent->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"),
                                       mEventListener, false);
 
-  if (XRE_IsContentProcess() &&
-      Preferences::GetBool("browser.tabs.remote.desktopbehavior", false)) {
+  if (ShouldFireDropDownEvent()) {
     nsContentUtils::AddScriptRunner(
       new AsyncEventDispatcher(mContent,
                                NS_LITERAL_STRING("mozhidedropdown"), true,
@@ -1789,8 +1794,7 @@ nsListControlFrame::GetIndexFromDOMEvent(nsIDOMEvent* aMouseEvent,
 static bool
 FireShowDropDownEvent(nsIContent* aContent, bool aShow, bool aIsSourceTouchEvent)
 {
-  if (XRE_IsContentProcess() &&
-      Preferences::GetBool("browser.tabs.remote.desktopbehavior", false)) {
+  if (ShouldFireDropDownEvent()) {
     nsString eventName;
     if (aShow) {
       eventName = aIsSourceTouchEvent ? NS_LITERAL_STRING("mozshowdropdown-sourcetouch") :
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 43c99e24bb01..7324fc28d398 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -117,6 +117,7 @@ pref("browser.download.forbid_open_with", false);
 
 // Whether or not testing features are enabled.
 pref("dom.quotaManager.testing", false);
+pref("dom.select_popup_in_parent.enabled", false);
 
 // Whether or not indexedDB is enabled.
 pref("dom.indexedDB.enabled", true);
diff --git a/toolkit/content/browser-content.js b/toolkit/content/browser-content.js
index 0e65e81ef73d..606920cda348 100644
--- a/toolkit/content/browser-content.js
+++ b/toolkit/content/browser-content.js
@@ -15,6 +15,8 @@ XPCOMUtils.defineLazyModuleGetter(this, "ReaderMode",
   "resource://gre/modules/ReaderMode.jsm");
 XPCOMUtils.defineLazyModuleGetter(this, "BrowserUtils",
   "resource://gre/modules/BrowserUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "SelectContentHelper",
+  "resource://gre/modules/SelectContentHelper.jsm");
 
 var global = this;
 
@@ -1825,3 +1827,22 @@ let TelemetryScrollTracker = {
 };
 
 TelemetryScrollTracker.init();
+
+addEventListener("mozshowdropdown", event => {
+  if (!event.isTrusted)
+    return;
+
+  if (!SelectContentHelper.open) {
+    new SelectContentHelper(event.target, {isOpenedViaTouch: false}, this);
+  }
+});
+
+addEventListener("mozshowdropdown-sourcetouch", event => {
+  if (!event.isTrusted)
+    return;
+
+  if (!SelectContentHelper.open) {
+    new SelectContentHelper(event.target, {isOpenedViaTouch: true}, this);
+  }
+});
+
diff --git a/toolkit/content/jar.mn b/toolkit/content/jar.mn
index ff42d0d325c4..8fa234faa2e2 100644
--- a/toolkit/content/jar.mn
+++ b/toolkit/content/jar.mn
@@ -62,7 +62,6 @@ toolkit.jar:
    content/global/resetProfile.js
    content/global/resetProfile.xul
    content/global/resetProfileProgress.xul
-   content/global/select-child.js
    content/global/TopLevelVideoDocument.js
    content/global/timepicker.xhtml
    content/global/treeUtils.js
diff --git a/toolkit/content/widgets/browser.xml b/toolkit/content/widgets/browser.xml
index c1987dd3cce7..5d493c77a27d 100644
--- a/toolkit/content/widgets/browser.xml
+++ b/toolkit/content/widgets/browser.xml
@@ -956,6 +956,12 @@
             this.messageManager.addMessageListener("AudioPlayback:Start", this);
             this.messageManager.addMessageListener("AudioPlayback:Stop", this);
             this.messageManager.addMessageListener("AudioPlayback:Block", this);
+
+            if (this.hasAttribute("selectmenulist")) {
+              this.messageManager.addMessageListener("Forms:ShowDropDown", this);
+              this.messageManager.addMessageListener("Forms:HideDropDown", this);
+            }
+
           }
         ]]>
       </constructor>
@@ -974,6 +980,11 @@
       <method name="destroy">
         <body>
           <![CDATA[
+          // Make sure that any open select is closed.
+          if (this._selectParentHelper) {
+            let menulist = document.getElementById(this.getAttribute("selectmenulist"));
+            this._selectParentHelper.hide(menulist, this);
+          }
           if (this.mDestroyed)
             return;
           this.mDestroyed = true;
@@ -1045,6 +1056,27 @@
             case "AudioPlayback:Block":
               this.audioPlaybackBlocked();
               break;
+            case "Forms:ShowDropDown": {
+              if (!this._selectParentHelper) {
+                this._selectParentHelper =
+                  Cu.import("resource://gre/modules/SelectParentHelper.jsm", {}).SelectParentHelper;
+              }
+
+              let menulist = document.getElementById(this.getAttribute("selectmenulist"));
+              menulist.menupopup.style.direction = data.direction;
+              this._selectParentHelper.populate(menulist, data.options, data.selectedIndex, this._fullZoom);
+              this._selectParentHelper.open(this, menulist, data.rect, data.isOpenedViaTouch);
+              break;
+            }
+
+            case "Forms:HideDropDown": {
+              if (this._selectParentHelper) {
+                let menulist = document.getElementById(this.getAttribute("selectmenulist"));
+                this._selectParentHelper.hide(menulist, this);
+              }
+              break;
+            }
+
           }
           return undefined;
         ]]></body>
diff --git a/toolkit/content/widgets/remote-browser.xml b/toolkit/content/widgets/remote-browser.xml
index 4d81a1a68c3c..32a4024b9e71 100644
--- a/toolkit/content/widgets/remote-browser.xml
+++ b/toolkit/content/widgets/remote-browser.xml
@@ -389,7 +389,6 @@
           if (this.hasAttribute("selectmenulist")) {
             this.messageManager.addMessageListener("Forms:ShowDropDown", this);
             this.messageManager.addMessageListener("Forms:HideDropDown", this);
-            this.messageManager.loadFrameScript("chrome://global/content/select-child.js", true);
           }
 
           if (!this.hasAttribute("disablehistory")) {
@@ -500,14 +499,6 @@
               break;
             }
 
-            case "Forms:HideDropDown": {
-              if (this._selectParentHelper) {
-                let menulist = document.getElementById(this.getAttribute("selectmenulist"));
-                this._selectParentHelper.hide(menulist, this);
-              }
-              break;
-            }
-
             case "DOMFullscreen:RequestExit": {
               let windowUtils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                                       .getInterface(Components.interfaces.nsIDOMWindowUtils);