--- a/toolkit/components/places/PageIconProtocolHandler.js
+++ b/toolkit/components/places/PageIconProtocolHandler.js
@@ -120,13 +120,14 @@ PageIconProtocolHandler.prototype = {
   },
 
   allowPort(port, scheme) {
     return false;
   },
 
   classID: Components.ID("{60a1f7c6-4ff9-4a42-84d3-5a185faa6f32}"),
   QueryInterface: XPCOMUtils.generateQI([
-    Ci.nsIProtocolHandler
+    Ci.nsIProtocolHandler,
+    Ci.nsISupportsWeakReference,
   ])
 };
 
 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([PageIconProtocolHandler]);