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

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

Firefox 4.0 will not install. I have Mac OSX 10.4.11. Error message 10661.

  • 1 resposta
  • 9 have this problem
  • 7 views
  • Last reply by cor-el

Lloyd Frohreich
Lloyd Frohreich
more options

I tried to install Firefox 4.0 and I got an error message 10661 and it said my system would not support it. I have Mac laptop with MAC OSX 10.4.11. Why won't it install using this operating system?

I tried to install Firefox 4.0 and I got an error message 10661 and it said my system would not support it. I have Mac laptop with MAC OSX 10.4.11. Why won't it install using this operating system?

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
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 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: