I am currently running Mac OS 10.3.9 and Firefox 2.0.0.20. I stumbled upon the page http://www.mozilla.org/en-US/firefox/all-older.html which provides disk images for version 3.6.22. Somehow, my version of Firefox never got switched / updated to this version of Firefox automatically, which I would have expected to happen. When I click on the link to download the Mac OS X US English version, I get a message that the disk image is corrupt. I thought the British might work, but it fails in the same way. Is Firefox 3.6.22 incompatible with OS 10.3.9? Maybe that's the problem. Thanks, Cheri