Bug 371807: reusing permissions dialog shouldn't keep adding observers, r=mano

git-svn-id: svn://10.0.0.236/trunk@220973 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/browser/components/preferences/permissions.js

@@ -170,6 +170,11 @@ var gPermissionManager = {
   
   init: function (aParams)
   {
+    if (this._type) {
+      // reusing an open dialog, clear the old observer
+      this.uninit();
+    }
+
     this._type = aParams.permissionType;
     
     var permissionsText = document.getElementById("permissionsText");