diff --git a/mobile/android/chrome/content/SelectionHandler.js b/mobile/android/chrome/content/SelectionHandler.js
index 7272bb788f07..0f4c204c6c2a 100644
--- a/mobile/android/chrome/content/SelectionHandler.js
+++ b/mobile/android/chrome/content/SelectionHandler.js
@@ -8,6 +8,10 @@
 const PHONE_NUMBER_CONTAINERS = "td,div";
 const DEFER_CLOSE_TRIGGER_MS = 125; // Grace period delay before deferred _closeSelection()
 
+// Gecko TouchCaret/SelectionCaret pref names.
+const PREF_GECKO_TOUCHCARET_ENABLED = "touchcaret.enabled";
+const PREF_GECKO_SELECTIONCARETS_ENABLED = "selectioncaret.enabled";
+
 var SelectionHandler = {
 
   // Successful startSelection() or attachCaret().
@@ -21,9 +25,11 @@ var SelectionHandler = {
   START_ERROR_SELECT_ALL_PARAGRAPH_FAILED: "Select-All Paragraph failed.",
   START_ERROR_NO_SELECTION: "Selection performed, but nothing resulted.",
   START_ERROR_PROXIMITY: "Selection target and result seem unrelated.",
+  START_ERROR_SELECTIONCARETS_ENABLED: "Native selectionCarets requested while Gecko enabled.",
 
   // Error codes returned during attachCaret().
   ATTACH_ERROR_INCOMPATIBLE: "Element disabled, handled natively, or not editable.",
+  ATTACH_ERROR_TOUCHCARET_ENABLED: "Native touchCaret requested while Gecko enabled.",
 
   HANDLE_TYPE_ANCHOR: "ANCHOR",
   HANDLE_TYPE_CARET: "CARET",
@@ -36,6 +42,10 @@ var SelectionHandler = {
   SELECT_ALL: 0,
   SELECT_AT_POINT: 1,
 
+  // Gecko TouchCaret/SelectionCaret pref values.
+  _touchCaretEnabledValue: null,
+  _selectionCaretEnabledValue: null,
+
   // Keeps track of data about the dimensions of the selection. Coordinates
   // stored here are relative to the _contentWindow window.
   _cache: { anchorPt: {}, focusPt: {} },
@@ -91,6 +101,30 @@ var SelectionHandler = {
       getService(Ci.nsIUUIDGenerator);
   },
 
+  // Are we supporting Gecko or Native touchCarets?
+  get _touchCaretEnabled() {
+    if (this._touchCaretEnabledValue == null) {
+      this._touchCaretEnabledValue = Services.prefs.getBoolPref(PREF_GECKO_TOUCHCARET_ENABLED);
+      Services.prefs.addObserver(PREF_GECKO_TOUCHCARET_ENABLED, function() {
+        SelectionHandler._touchCaretEnabledValue =
+          Services.prefs.getBoolPref(PREF_GECKO_TOUCHCARET_ENABLED);
+      }, false);
+    }
+    return this._touchCaretEnabledValue;
+  },
+
+  // Are we supporting Gecko or Native selectionCarets?
+  get _selectionCaretEnabled() {
+    if (this._selectionCaretEnabledValue == null) {
+      this._selectionCaretEnabledValue = Services.prefs.getBoolPref(PREF_GECKO_SELECTIONCARETS_ENABLED);
+      Services.prefs.addObserver(PREF_GECKO_SELECTIONCARETS_ENABLED, function() {
+        SelectionHandler._selectionCaretEnabledValue =
+          Services.prefs.getBoolPref(PREF_GECKO_SELECTIONCARETS_ENABLED);
+      }, false);
+    }
+    return this._selectionCaretEnabledValue;
+  },
+
   _addObservers: function sh_addObservers() {
     Services.obs.addObserver(this, "Gesture:SingleTap", false);
     Services.obs.addObserver(this, "Tab:Selected", false);
@@ -378,6 +412,11 @@ var SelectionHandler = {
    *                   y    - The y-coordinate for SELECT_AT_POINT.
    */
   startSelection: function sh_startSelection(aElement, aOptions = { mode: SelectionHandler.SELECT_ALL }) {
+    // Disable Native touchCarets if Gecko enabled.
+    if (this._selectionCaretEnabled) {
+      return this.START_ERROR_SELECTIONCARETS_ENABLED;
+    }
+
     // Clear out any existing active selection
     this._closeSelection();
 
@@ -837,6 +876,11 @@ var SelectionHandler = {
    * @param aX, aY tap location in client coordinates.
    */
   attachCaret: function sh_attachCaret(aElement) {
+    // Disable Native attachCaret() if Gecko touchCarets are enabled.
+    if (this._touchCaretEnabled) {
+      return this.ATTACH_ERROR_TOUCHCARET_ENABLED;
+    }
+
     // Clear out any existing active selection
     this._closeSelection();
 
diff --git a/mobile/android/chrome/content/browser.js b/mobile/android/chrome/content/browser.js
index 35bdc15be7cf..50b86f8bf8fe 100644
--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -154,6 +154,12 @@ let lazilyLoadedObserverScripts = [
   ["EmbedRT", ["GeckoView:ImportScript"], "chrome://browser/content/EmbedRT.js"],
   ["Reader", ["Reader:FetchContent", "Reader:Added", "Reader:Removed"], "chrome://browser/content/Reader.js"],
 ];
+if (AppConstants.NIGHTLY_BUILD) {
+  lazilyLoadedObserverScripts.push(
+    ["ActionBarHandler", ["ActionBar:OpenNew", "ActionBar:Close", "TextSelection:Get"],
+      "chrome://browser/content/ActionBarHandler.js"]
+  );
+}
 if (AppConstants.MOZ_WEBRTC) {
   lazilyLoadedObserverScripts.push(
     ["WebrtcUI", ["getUserMedia:request", "recording-device-events"], "chrome://browser/content/WebrtcUI.js"])
diff --git a/mobile/android/chrome/jar.mn b/mobile/android/chrome/jar.mn
index 53991ce97720..8c6ee9d9c759 100644
--- a/mobile/android/chrome/jar.mn
+++ b/mobile/android/chrome/jar.mn
@@ -35,6 +35,7 @@ chrome.jar:
   content/netError.xhtml               (content/netError.xhtml)
   content/SelectHelper.js              (content/SelectHelper.js)
   content/SelectionHandler.js          (content/SelectionHandler.js)
+  content/ActionBarHandler.js          (content/ActionBarHandler.js)
   content/WebappRT.js                  (content/WebappRT.js)
   content/EmbedRT.js                   (content/EmbedRT.js)
   content/InputWidgetHelper.js         (content/InputWidgetHelper.js)
diff --git a/mobile/android/installer/package-manifest.in b/mobile/android/installer/package-manifest.in
index 45682229facf..bfb8cabdf656 100644
--- a/mobile/android/installer/package-manifest.in
+++ b/mobile/android/installer/package-manifest.in
@@ -546,6 +546,20 @@
 @BINPATH@/res/html/*
 @BINPATH@/res/language.properties
 @BINPATH@/res/entityTables/*
+#ifdef NIGHTLY_BUILD
+@BINPATH@/res/text_caret.png
+@BINPATH@/res/text_caret@1.5x.png
+@BINPATH@/res/text_caret@2.25x.png
+@BINPATH@/res/text_caret@2x.png
+@BINPATH@/res/text_caret_tilt_left.png
+@BINPATH@/res/text_caret_tilt_left@1.5x.png
+@BINPATH@/res/text_caret_tilt_left@2.25x.png
+@BINPATH@/res/text_caret_tilt_left@2x.png
+@BINPATH@/res/text_caret_tilt_right.png
+@BINPATH@/res/text_caret_tilt_right@1.5x.png
+@BINPATH@/res/text_caret_tilt_right@2.25x.png
+@BINPATH@/res/text_caret_tilt_right@2x.png
+#endif
 
 #ifndef MOZ_ANDROID_EXCLUDE_FONTS
 @BINPATH@/res/fonts/*