The last version that works on OS X 10.3.9 is the one that you have, later versions require OS X 10.4

Unfortunately, I'm writing about a second computer which does not presently have Firefox. I presume that means Firefox 2.0.0.20. Will the download area control the process?

You can get the English US version of Firefox 2.0.0.20 from ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/

Where O Where do I get a version of Firefox/Mozilla that works with Mac OS X v10.3.9? [Please learn that I'm in No Hurry to upgrade my computer. It has 640 MB of RAM.]

My eldest brother added 512 MB. Before with 128 MB, my Mac used Virtual Memory a-whole lot, but it _never_ failed!  :-)

You can contact me by email at BobNovy@aol.com. Thank you.

Bob Novy, see the link in the post just above yours.