Bug 634974 - JavaScript strict warning: chrome://browser/content/tabview.js, line 3274: anonymous function does not always return a value [r=ian, a=beltzner]

browser/base/content/tabview/groupitems.js

@@ -1126,7 +1126,6 @@ GroupItem.prototype = Utils.extend(new Item(), new Subscribable(), {
       let $icon = iQ(icon);
       if ($icon.data("xulTab") == event.target) {
         $icon.attr("src", Utils.defaultFaviconURL);
-        return true;
       }
     });
   },