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

My Mac X10.5.8 PCG5. Can't open Firefox 4 'not supported on this architecture' why not?

  • 1 phendula
  • 130 inale ngxaki
  • 3 views
  • Impendulo yokugqibela ngu the-edmeister

more options

When I tried to open Firefox 4 a dialogue box opened stating "Can't open the application Firefox because it is not supported on this architecture"

When I tried to open Firefox 4 a dialogue box opened stating "Can't open the application Firefox because it is not supported on this architecture"

All Replies (1)

more options

For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/