We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

Hilfe durchsuchen

Vorsicht vor Support-Betrug: Wir fordern Sie niemals auf, eine Telefonnummer anzurufen, eine SMS an eine Telefonnummer zu senden oder persönliche Daten preiszugeben. Bitte melden Sie verdächtige Aktivitäten über die Funktion „Missbrauch melden“.

Weitere Informationen

How do I undo a Firefox upgrade that went onto my computer but is incompatible and is now preventing me from accessing the Web?

  • 1 Antwort
  • 42 haben dieses Problem
  • 4 Aufrufe
  • Letzte Antwort von cor-el

more options

Hello. Please help! I just upgraded from Firefox 3.6.22 to Firefox 4.0 on my Mac PowerBook G4 laptop. I run Mac OS X Tiger 10.4. I did not know that Firefox 4.0 would go onto my computer if it was not compatible. It downloaded and replaced the old version. When I went to open up Firefox, it told me it could not open because the system was incompatible. Now I cannot access the Internet using Firefox, which I prefer to other browsers. How can I go back to my old version of Firefox?

Thank you.

Hello. Please help! I just upgraded from Firefox 3.6.22 to Firefox 4.0 on my Mac PowerBook G4 laptop. I run Mac OS X Tiger 10.4. I did not know that Firefox 4.0 would go onto my computer if it was not compatible. It downloaded and replaced the old version. When I went to open up Firefox, it told me it could not open because the system was incompatible. Now I cannot access the Internet using Firefox, which I prefer to other browsers. How can I go back to my old version of Firefox? Thank you.

Alle Antworten (1)

more options

Firefox 4 versions and later do not run on a PowerPC Mac.

Firefox 4 and later require at least OS X 10.5 and an Intel Mac.

For an unofficial Firefox 6 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:

Firefox 3.6.x (Mac OS X 10.4 and later) can be found here: