Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

I upgraded to 4.0, was to new for G4, refused to load. I have dumped all I can find. Now can not reload 3.5. any help? Thanks Lee

  • 1 freagra
  • 6 leis an bhfadhb seo
  • 4 views
  • Freagra is déanaí ó TonyE

more options

Firefox after installing 4.o when I tryed to use Firefox it refused and a round circle with a diagonal line across was over the Firefox Icon. It did give an error # but I do not have it. Lee

Firefox after installing 4.o when I tryed to use Firefox it refused and a round circle with a diagonal line across was over the Firefox Icon. It did give an error # but I do not have it. Lee

All Replies (1)

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