Tap here to go to the mobile version of the site.
Your Firefox is out of date and may contain a security risk! Upgrade Firefox

Support Forum

I installed Firefox 18 but it doesnt open or function


Firefox 18 is installed and it doesn't nor function. I uninstalled it and reinstalled it but no luck. When I try to open firefox 18 a message comes up which says"A copy ofirefox is already open. Only one copy of Firefox can be open at one time." I uninstalled every copy of Firefox But nothing works. I cannot reset fire fox as it does not open.

Additional System Details


  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1

More Information