[Mypal] Pref detach&tear-off tab handling.

application/palemoon/app/profile/mypal.js

@@ -458,6 +458,10 @@ pref("browser.tabs.showAudioPlayingIcon", true);
 // This should match Chromium's audio indicator delay.
 pref("browser.tabs.delayHidingAudioPlayingIconMS", 3000);
 
+// Whether dragging a tab off the tab bar to tear it off into its own
+// window is enabled.
+pref("browser.tabs.allowTabDetach", true);
+
 pref("browser.allTabs.previews", true);
 pref("browser.allTabs.hidePinnedTabs", false);
 pref("browser.ctrlTab.previews", true);

application/palemoon/base/content/tabbrowser.xml

@@ -4837,6 +4837,11 @@
           return;
         }
 
+        // Check if tab detaching is enabled
+        if (!Services.prefs.getBoolPref("browser.tabs.allowTabDetach")) {
+          return;
+        }
+
         // Disable detach within the browser toolbox
         var eX = event.screenX;
         var eY = event.screenY;