Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

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

There is a block out sign on the firefox icon that I am supposed to drag to the application. Why is that?

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

more options

My system is Mac 10.4.11. I want to upgrade to firefox 4.1 but the icon had a block sign (∅) over it when I went to drag it to the application. Since I could find no compatibility link, I am not sure I can upgrade using my current system. What does the block out sign mean and where can I see compatibility recommendations for my system?

My system is Mac 10.4.11. I want to upgrade to firefox 4.1 but the icon had a block sign (∅) over it when I went to drag it to the application. Since I could find no compatibility link, I am not sure I can upgrade using my current system. What does the block out sign mean and where can I see compatibility recommendations for my system?

All Replies (1)

more options

Firefox 4 doesn't run on a PowerPC Mac.

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: