Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

I can not open ff4(after installed) with a note you cannot use the application "firefox. app" with this version of Mac OS X.

  • 1 reply
  • 5 have this problem
  • 2 views
  • Last reply by cor-el

sungkim100
sungkim100
more options

I had ff3, but I upgraded to ff4. But in process of upgrading to ff4 I almost 70 times of dragging from ff simbol to applications, I am so tired of repeating it, So I stopped. and as last step I dragged ff simbol from appplication to side ff simbol. Next day I tried re-download over it, But it happen same thing, it says "you cannot use application"firefox. app" with this version of Mac OS X."

I had ff3, but I upgraded to ff4. But in process of upgrading to ff4 I almost 70 times of dragging from ff simbol to applications, I am so tired of repeating it, So I stopped. and as last step I dragged ff simbol from appplication to side ff simbol. Next day I tried re-download over it, But it happen same thing, it says "you cannot use application"firefox. app" with this version of Mac OS X."

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

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

For Mac OS X 10.4.11 or Mac OS X 10.5.8 you can look at:

Firefox 3.6.x can be found here: