When any of the users on my network open Outlook webmail through Firefox, they are experiencing the error below (randomly throughout the day). When you try to close the error, it does not go away. F5 will clear the error so they can continue to work, but it continues to be disruptive. Error A Web browsing error occurred. The entire error report is listed below: Hide Report View Privacy Statement Client Information ------------------ User Agent: Mozilla/5.0 (Windows NT 6.1; rv:27.0) Gecko/20100101 Firefox/27.0 CPU Class: Platform: Win32 System Language: User Language: en-US CookieEnabled: true Exception Details ----------------- Date: Wed Feb 19 2014 10:42:08 GMT-0500 (Eastern Standard Time) Message: uncaught exception: cannot cancel the callback when it is already finished or cancelled Url: Line: 0 Call Stack ---------- undefinedwindow$onerror@https://owa.lgca.org/owa/14.0.702.0/scripts/premium/uglobal.js:1 function Array$get_Length(){return this.length} function Array$get_Item(index){return this[index]} function Array$get_Enumerator(){return new Owa.Collections.ListEnumerator(this)} function Array$remove(oItem){var index=this.indexOf(oItem);if(index>-1){this.splice(index,1)}return(index>-1)} function Array$removeAt(iIndex){if(iIndex<this.length){this.splice(iIndex,1);return true}return false} function Array$add(oItem){this.push(oItem)} function Array$clone(){return this.slice()}