Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Installed firefox 4 it does not work. "You cannot open the application “Firefox” because it is not supported on this architecture". How do I get firefox back?

  • 3 replies
  • 52 have this problem
  • 1 view
  • Last reply by pissedoff13

more options

Running emac (1.25 GHz) G4 processor - 1GB DDR ram - OS X 10.5.8 Tried to update to Firefox 4 today. Cannot now run firefox at all. Error message - "You cannot open the application “Firefox” because it is not supported on this architecture". In my dock Firefox symbol has a No Entry symbol across it.

How do I get firefox back?
Running emac (1.25 GHz) G4 processor - 1GB DDR ram - OS X 10.5.8 Tried to update to Firefox 4 today. Cannot now run firefox at all. Error message - "You cannot open the application “Firefox” because it is not supported on this architecture". In my dock Firefox symbol has a No Entry symbol across it. How do I get firefox back?

Chosen solution

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

Read this answer in context 👍 5

All Replies (3)

more options

Chosen Solution

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

more options

Thank you. Have reinstalled older version of Firefox with all my bookmarks etc.. I think Mozilla should make it clearer that Firefox 4 is not compatible with G4 Macs.

more options

Really.. Ya think they'd mention that small bit of information.. What a hassle.