You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

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

You are great TonyE thank you so much, i have it back and i don't need Firefox 4, because that don't work on my iMac. i tried and tried that for days but always a kind of sign not to park. So i have 3.6 back and thas is great, thanks again TonyE.