You can not upgrade, Firefox 2.0.0.20 is the last version that works on OS X 10.3.9, later versions of Firefox require at least OS X 10.4

Thanks TonyE.

We know that OSX 10.4 is needed for Firefox 3 but given that 10.3.9 was so close in functioing to 10.4, has anyone heard of or seen Firefox 3 working O.K. with 10.3.9 We just don't have the cash yet for upgrading our Mac OS.

I have never seen any way around this. Firefox 3 and above use OS features that are not present in OS X 10.3.9

There are other browsers that will work on OS X 10.3.9.

• http://www.seamonkey-project.org/releases/seamonkey1.1.19
• http://caminobrowser.org/download/releases/ (#os10.3.8)
• iCab: http://www.icab.de/