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!

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

just downloaded firefox4 and when i try to open it get an error message on mac saying 'you cannot use the application "firefox" with this version of Mac OS X'. what do i do?

  • 3 replies
  • 7 have this problem
  • 1 view
  • Last reply by jameslw

more options

is my mac os 10.4.11 too old for version 4 of firefox? if so how do i get back o older version?

is my mac os 10.4.11 too old for version 4 of firefox? if so how do i get back o older version?

All Replies (3)

more options

Firefox 3 requires at least OS X 10.5, you can get Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

more options

thank you for your help. It is appreciated

more options

thanks for help. they should check system before allowing you to replace with something that doesn't work, especially as had taken safari off system, so major pain getting access to net again. but all done now