diff --git a/profile/chrome/utils/boot.jsm b/profile/chrome/utils/boot.jsm
index fe528a3..d34e515 100644
--- a/profile/chrome/utils/boot.jsm
+++ b/profile/chrome/utils/boot.jsm
@@ -39,6 +39,7 @@ const yPref = {
 };
 
 const SHARED_GLOBAL = {};
+Object.defineProperty(SHARED_GLOBAL,"widgetCallbacks",{value:new Map()});
 
 function resolveChromeURL(str){
   const registry = Cc["@mozilla.org/chrome/chrome-registry;1"].getService(Ci.nsIChromeRegistry);