On 10/22/2014 Firefox (Nightly) was performing a daily update. I have been using this version of Firefox for months.
During the update I received error messages from N360.
Then Firefox displayed this error message on start-up.
So I opened Security History and found:
Xul.dll proved to be a Firefox file.
This hasn't happened before or since. I notified Mozilla. I got no response to see if that particular build of xul.dll was infected.
I can't find a place on Norton to report this.
When I followed the More Info link it took me to Norton Enterprise.
TIA for any suggestions.