fix bug 43227 error in mac menu, r=dbragg

xpfe/communicator/resources/content/tasksOverlay.js

@@ -256,6 +256,7 @@ function CheckForWalletAndImage()
   // remove quickfill since it was just for development purposes
   element = document.getElementById("walletQuickFill");
   element.setAttribute("style","display: none;" );
+  element.setAttribute("disabled","true" );
 
   // remove wallet functions if not in browser
   try {