This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

just replaced my old version of firefox with version 4 however after I replaced it in my applicatios folder it became clear that the new version does not work on my machine. I now cannot get back my older version and have no firefox, or my bookmarks etc

more options

I have a powerbook G4 running OSX v 10.4.11.

I have a powerbook G4 running OSX v 10.4.11.

All Replies (2)

more options

Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

If you prefer, you can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

more options

Thank you Tony, I have reinstalled the older version of firefox.

Thanks for your help