Tip: load about: in Firefox's address bar to display the version of the browser installed on your machine.īug 1305453 on Bugzilla lists the plan to stop stand-alone Firefox 53 and up installers from installing Firefox on XP or Vista machines. Firefox 53: no support for Windows XP or Vista The organization plans to migrate Firefox users on XP or Vista to Firefox ESR automatically however to extend support. It is unclear whether it plans to block execution of portable versions of Firefox as well. Mozilla explicitly mentions installations that it plans to block. This means that Firefox 52 will be the last feature update for those operating systems, as Firefox 53 cannot be installed anymore on those operating systems.
