Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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

I downloaded firefox 4 on my mac 10.5 but it will not open - the message says It is not supported in this architechure but I have replaced my old firefox and now cannot open anything

  • 1 reply
  • 6 have this problem
  • 8 views
  • Last reply by TonyE

more options

I thought I was updated the firefox to the new 4 version. When I moved the download to my applications folder I replaced the older version. When I went to open the new version it would not open.

I thought I was updated the firefox to the new 4 version. When I moved the download to my applications folder I replaced the older version. When I went to open the new version it would not open.

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

Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com