Firefox 3.6 should work fine on an Intel Mac with OSX 10.4.
http://www.mozilla.com/en-US/firefox/system-requirements.html

Try downloading it from here:
http://www.mozilla.com/en-US/firefox/all.html

Thanks so much. I see that the compatibility is not the problem. I uninstalled Firefox 2.0 and the did the installation of 3.6 and it worked! Yay! Thank you for your help.

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

Older versions and less hassle for some of us Mac folks.

I am using 3.6.15 firefox on an old eMac 10.4 pre-intel. What is the most current firefox release I can use on my current computer?

You can find the latest Firefox release in all languages and for all Operating Systems here:

• Firefox 3.6: http://www.mozilla.org/en-US/firefox/all-older.html

Firefox 4 and later require at least OS X 10.5 and a Mac with an Intel processor.

• http://www.mozilla.org/firefox/11.0/system-requirements/

For an unofficial Firefox 10.0.3 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:

• http://www.floodgap.com/software/tenfourfox/
• http://www.macupdate.com/app/mac/37761/tenfourfox

• http://code.google.com/p/tenfourfox/wiki/ReleaseNotes1003
• http://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported
• http://code.google.com/p/tenfourfox/wiki/AAATheFAQ

Just before receiving this info I found (somehow) the place to download 3.6.28 and i Have downloaded it. Took an hour to find it.

Thanks for your help.