Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

Pomoc pśepytaś

Glědajśo se wobšudy pomocy. Njenapominajomy was nigda, telefonowy numer zawołaś, SMS pósłaś abo wósobinske informacije pśeraźiś. Pšosym dajśo suspektnu aktiwitu z pomocu nastajenja „Znjewužywanje k wěsći daś“ k wěsći.

Dalšne informacije
Toś ta nitka jo se archiwěrowała. Pšosym stajśo nowe pšašanje, joli trjebaśo pomoc.
Archiwěrowany

After upgrading from 54.0.1 to 55.0.2 - Firefox will not open

Firefox Instalacija a aktualizacije
cor-el wótegronjony
wischjj
wischjj

We are using the standalone installer to upgrade our fleet from 54.0.1 to 55.0.2 and after the install Firefox will not load. It shows up in Task Manager processes, but the window doesn't actually open. I have tried 55.0, 55.0.1, and 55.0.2 - none of them work. I even tried going to Help-About-Update, the same thing happens.

We are using the standalone installer to upgrade our fleet from 54.0.1 to 55.0.2 and after the install Firefox will not load. It shows up in Task Manager processes, but the window doesn't actually open. I have tried 55.0, 55.0.1, and 55.0.2 - none of them work. I even tried going to Help-About-Update, the same thing happens.

Wšykne wótegrona (1)

cor-el
cor-el
  • Moderator

Some basic Troubleshooting steps you can try:

Try to start Firefox in Safe Mode to see whether that works.

  • Windows: hold down the Shift key while starting Firefox
  • Mac: hold down the Options key while starting Firefox

You can create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen or hold down the Shift key) to see whether that has effect.