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

Why is the new Firefox upgrade incompatible with my Mac now??

  • 3 replies
  • 1 has this problem
  • 1 view
  • Last reply by cor-el

more options

I love using Firefox, it's by far my favorite browser. But when I opened it this morning, it says I am no longer protected because of the older version I'm using. I want to download the new version but it says that it is incompatible with my computer.  ?? This is the same operating system I've used and it's on the list of compatible OS....mac 10.5.

HELP please! I miss it already!

I love using Firefox, it's by far my favorite browser. But when I opened it this morning, it says I am no longer protected because of the older version I'm using. I want to download the new version but it says that it is incompatible with my computer. ?? This is the same operating system I've used and it's on the list of compatible OS....mac 10.5. HELP please! I miss it already!

All Replies (3)

more options

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

For an unofficial Firefox 4 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:

more options

Thank you! I'll go with TenFourFox and hope Firefox comes to its senses.