[Basilisk] [Tabbed browser] Pref detach&tear-off of tabs.

See MoonchildProductions/Pale-Moon#1845

application/basilisk/app/profile/basilisk.js

@@ -414,6 +414,10 @@ pref("browser.tabs.delayHidingAudioPlayingIconMS", 3000);
 
 pref("browser.tabs.dontfocusfordialogs", true);
 
+// 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.ctrlTab.previews", false);
 
 // By default, do not export HTML at shutdown.

application/basilisk/base/content/tabbrowser.xml

@@ -6373,6 +6373,11 @@
           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;