Firefox Community Forum

Since the latest Firefox update, it hangs immediately at startup. Now it never works, while other browsers always work. This is a fully updated Windows 10 computer. Even when it does work, Firefox's special tabs - About, Close Firefox, Restore session - are often big trouble; and it seems possible one of these may be the problem now. When Firefox is working. it either closes slowly or not at all, bringing always problematic "Firefox is already running - Close Firefox" messages. When one Firefox window is closed, Firefox always keeps the window that is causing trouble in the first place. So, two things. 1) Firefox doesn't work at all. If you fix this problem with an update, the update must start immediately because clicking on "Download Update" too will be hung. 2) You have terribly problematic special tabs which I have named above. It is my opinion that you cannot fix them - you have to rebuild them from scratch - otherwise they would be working properly right now. I have fallen back on Microsoft Edge which always works. Firefox is never working. Think about it.

Moin, seit einigen Tagen startet Firefox bei Klick auf das Symbol in der Taskleiste nicht. Wenn ich mehrmals klicke erscheint Firefox soviele Male wie geklickt. Mein System: Win11 25H2. Kann jemand helfen?

Hello,

I have the following error message......."The Application has failed to start because its side-by-side configuration is incorrect. Please see the application event log or use the command-line sestrace.exe tool for more detail?

This error message pops up when I click on the Firefox icon. How do I correct this error message?

Thank you.

Firefox keeps crashing/hanging on startup. Any other browser I use is fine. Been using Firefox for years and would like to keep using it. This has been going on since August, so I have not really been using it since then. Tried all the troubleshoot steps that Mozilla recommends but still crashing e.g reinstall, fresh install.