--- a/browser/base/content/test/forms/head.js
+++ b/browser/base/content/test/forms/head.js
@@ -1,12 +1,13 @@
 function hideSelectPopup(selectPopup, mode = "enter", win = window) {
   let browser = win.gBrowser.selectedBrowser;
   let selectClosedPromise = ContentTask.spawn(browser, null, async function() {
-    ChromeUtils.import("resource://gre/modules/SelectContentHelper.jsm");
+    let {SelectContentHelper} =
+      ChromeUtils.import("resource://gre/modules/SelectChild.jsm", {});
     return ContentTaskUtils.waitForCondition(() => !SelectContentHelper.open);
   });
 
   if (mode == "escape") {
     EventUtils.synthesizeKey("KEY_Escape", {}, win);
   } else if (mode == "enter") {
     EventUtils.synthesizeKey("KEY_Enter", {}, win);
   } else if (mode == "click") {

rename from toolkit/modules/SelectContentHelper.jsm
rename to toolkit/actors/SelectChild.jsm
--- a/toolkit/modules/SelectContentHelper.jsm
+++ b/toolkit/actors/SelectChild.jsm
@@ -1,14 +1,17 @@
+/* vim: set ts=2 sw=2 sts=2 et tw=80: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
 "use strict";
 
+var EXPORTED_SYMBOLS = ["SelectChild"];
+
+ChromeUtils.import("resource://gre/modules/ActorChild.jsm");
 ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
 
 ChromeUtils.defineModuleGetter(this, "BrowserUtils",
                                "resource://gre/modules/BrowserUtils.jsm");
 ChromeUtils.defineModuleGetter(this, "DeferredTask",
                                "resource://gre/modules/DeferredTask.jsm");
 
 XPCOMUtils.defineLazyGlobalGetters(this, ["InspectorUtils"]);
@@ -23,20 +26,16 @@ const SUPPORTED_PROPERTIES = [
 ];
 
 // A process global state for whether or not content thinks
 // that a <select> dropdown is open or not. This is managed
 // entirely within this module, and is read-only accessible
 // via SelectContentHelper.open.
 var gOpen = false;
 
-var EXPORTED_SYMBOLS = [
-  "SelectContentHelper"
-];
-
 var SelectContentHelper = function(aElement, aOptions, aGlobal) {
   this.element = aElement;
   this.initialSelection = aElement[aElement.selectedIndex] || null;
   this.global = aGlobal;
   this.closedWithClickOn = false;
   this.isOpenedViaTouch = aOptions.isOpenedViaTouch;
   this._selectBackgroundColor = null;
   this._selectColor = null;
@@ -417,8 +416,26 @@ function buildOptionListForChildren(node
         info.textShadow = cs.textShadow;
       }
 
       result.push(info);
     }
   }
   return result;
 }
+
+class SelectChild extends ActorChild {
+  handleEvent(event) {
+    if (SelectContentHelper.open) {
+      return;
+    }
+
+    switch (event.type) {
+    case "mozshowdropdown":
+      new SelectContentHelper(event.target, {isOpenedViaTouch: false}, this.mm);
+      break;
+
+    case "mozshowdropdown-sourcetouch":
+      new SelectContentHelper(event.target, {isOpenedViaTouch: true}, this.mm);
+      break;
+    }
+  }
+}

--- a/toolkit/actors/moz.build
+++ b/toolkit/actors/moz.build
@@ -3,9 +3,10 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 FINAL_TARGET_FILES.actors += [
     'AudioPlaybackChild.jsm',
     'ExtFindChild.jsm',
     'FindBarChild.jsm',
+    'SelectChild.jsm',
 ]

--- a/toolkit/content/browser-content.js
+++ b/toolkit/content/browser-content.js
@@ -12,18 +12,16 @@ ChromeUtils.import("resource://gre/modul
 ChromeUtils.import("resource://gre/modules/ActorManagerChild.jsm");
 
 ActorManagerChild.attach(this);
 
 ChromeUtils.defineModuleGetter(this, "AutoCompletePopup",
   "resource://gre/modules/AutoCompletePopupContent.jsm");
 ChromeUtils.defineModuleGetter(this, "AutoScrollController",
   "resource://gre/modules/AutoScrollController.jsm");
-ChromeUtils.defineModuleGetter(this, "SelectContentHelper",
-  "resource://gre/modules/SelectContentHelper.jsm");
 ChromeUtils.defineModuleGetter(this, "PrintingContent",
   "resource://gre/modules/PrintingContent.jsm");
 
 XPCOMUtils.defineLazyServiceGetter(this, "formFill",
                                    "@mozilla.org/satchel/form-fill-controller;1",
                                    "nsIFormFillController");
 
 var global = this;
@@ -204,29 +202,11 @@ let AutoComplete = {
       }
       break;
     }
   },
 };
 
 AutoComplete.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);
-  }
-});
-
 addEventListener("ShieldPageEvent", ShieldFrameListener, false, true);
 
 addEventListener("mozUITour", UITourListener, false, true);

--- a/toolkit/modules/ActorManagerParent.jsm
+++ b/toolkit/modules/ActorManagerParent.jsm
@@ -125,16 +125,26 @@ let ACTORS = {
   FindBar: {
     child: {
       module: "resource://gre/actors/FindBarChild.jsm",
       events: {
         "keypress": {mozSystemGroup: true},
       },
     },
   },
+
+  Select: {
+    child: {
+      module: "resource://gre/actors/SelectChild.jsm",
+      events: {
+        "mozshowdropdown": {},
+        "mozshowdropdown-sourcetouch": {},
+      },
+    },
+  },
 };
 
 class ActorSet {
   constructor(group, actorSide) {
     this.group = group;
     this.actorSide = actorSide;
 
     this.actors = new Map();

--- a/toolkit/modules/moz.build
+++ b/toolkit/modules/moz.build
@@ -237,17 +237,16 @@ EXTRA_JS_MODULES += [
     'PromiseMessage.jsm',
     'PromiseUtils.jsm',
     'RemoteController.js',
     'RemoteFinder.jsm',
     'RemoteSecurityUI.jsm',
     'RemoteWebProgress.jsm',
     'ResetProfile.jsm',
     'ResponsivenessMonitor.jsm',
-    'SelectContentHelper.jsm',
     'SelectionSourceContent.jsm',
     'SelectParentHelper.jsm',
     'ServiceRequest.jsm',
     'Services.jsm',
     'sessionstore/FormData.jsm',
     'sessionstore/ScrollPosition.jsm',
     'ShortcutUtils.jsm',
     'Sqlite.jsm',