Mac OSX 10.4.11 isn't compatible.
http://www.mozilla.com/en-US/firefox/4.0/system-requirements/

We know that. The question is how to get the older version that is compatible back!

Re-install here: http://www.mozilla.com/en-US/firefox/all-older.html.

I used the link and it downloaded 3.6 without it automatically switching back to 4.0. Thank you, thank you, thank you!

got it !!!

thanks a BUNCH.

This version is only working for Intel based macs. Why does mozilla encourage everyone to upgrade with out making it known that the new version wont work on a power pc. Also why does it not work they are still supporting ten year old windows XP.

You can download 3.6 here:

http://mac.softpedia.com/progDownload/Firefox-Download-3007.html

All your old bookmarks and tabs will be there. I guess the circle with a slash through it was ignored by many of us. Mozilla should have checked our hardware, and warned us.

Thanks for the link... The Circle with the line through it did not show up until after I moved the icon into applications and update had completed... So I'm not sure this is totally user error. System Requirements should have been listed on download page. That's usual standard practice. Glad there's a way to correct this.