Fx5 actually requires Mac 10.5 -

http://www.mozilla.com/en-US/firefox/system-requirements.html

This was not posted yesterday (or this morning) from what I can remember! But thank you alan.

Please click the Solved It button next to the answer that answered or solved your Firefox support issue, it appears when you are logged in, so this thread gets marked as Solved to help other users who may have this same problem.

http://www.mozilla.com/en-US/firefox/5.0/releasenotes/

http://www.mozilla.com/en-US/firefox/4.0/releasenotes/
http://www.mozilla.com/en-US/firefox/3.6/releasenotes/

http://www.mozilla.com/en-US/firefox/5.0/system-requirements/ http://www.mozilla.com/en-US/firefox/4.0/system-requirements/ http://www.mozilla.com/en-US/firefox/3.6/system-requirements/

For 4.0 and 5.0 Operating Systems

   Mac OS X 10.5
   Mac OS X 10.6

Recommended Hardware

   Macintosh computer with an Intel x86 processor

The 3.6.16 is old as the Firefox 3.6.19 is the most current, though since you are a Mac OSX 10.4 user, the 3.6.18 would be ok as the 3.6.19 was to fix a issue with certain fonts crashing Firefox on OSX 10.7 Lion.

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

http://www.mozilla.org/security/known-vulnerabilities/firefox36.html

Thanks James! That would offer better surfing I suppose (the 3.16.18 or .19). I appreciate you posting the link so I know where I can download it!