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.

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

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Mac displays warning -- You can't open the application "Firefox" because it is not supported on this architecture

  • 2 respostas
  • 13 have this problem
  • 10 views
  • Last reply by Barry23

Barry23
Barry23
more options

I have downloaded the file Firefox 7.0b1.dmg When opened this window displays the Firefox symbol but with a white circle and diagonal bar -- presumably an error symbol. When this is dragged onto the application symbol as directed and the file is opened the message 'You can't open the application "Firefox" because it is not supported on this architecture' is displayed. I have previously run Firefox 2.0.0.20 successfully for many years. My computer operating system is Mac OSX 10.5.8 Can you please advise?

I have downloaded the file Firefox 7.0b1.dmg When opened this window displays the Firefox symbol but with a white circle and diagonal bar -- presumably an error symbol. When this is dragged onto the application symbol as directed and the file is opened the message 'You can't open the application "Firefox" because it is not supported on this architecture' is displayed. I have previously run Firefox 2.0.0.20 successfully for many years. My computer operating system is Mac OSX 10.5.8 Can you please advise?

All Replies (2)

the-edmeister
the-edmeister
  • Moderator
more options

Firefox 4 and later versions don't support PPC Macs.

For older Macs that aren't supported in Firefox 4 / 5 / 6, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/
http://code.google.com/p/tenfourfox/downloads/list

Or use 3.6.20
http://www.mozilla.com/en-US/firefox/all-older.html

Barry23
Barry23 Question owner
more options

Dear the-edmeister Many thanks for your helpful advice. I have downloaded TenFourFox as recommended. This seems to work perfectly -- as you will gather from this reply. Keep up the good work helping 'the-not-so-competent' like me!! Best wishes Barry23