DanA - 9:40 pm on Nov 11, 2004 (gmt 0)
Using Linux you can have many versions installed.
With Windows, I used to have more than one version with the zip download provided.
I have the last firefox version (exe install)which has a profile in the folder application data/mozilla/firefox and a firebird version (zip) which has a profile in the folder application data/phoenix.
Both work fine.