Installing Firefox 3.0.15 beside 3.5.4 on Karmic

[Mike.lifeguard]

Hello,

Karmic has Firefox 3.5.4, but I require the use of several extensions
which are not yet compatible with that version. How can I install 3.0.15
alongside the new version? The standard respositories for Karmic don't
seem to have any 3.0 versions, and I'm unsure if it is OK to put a line
in sources.list for Jaunty. I haven't been able to find a 3.0.15 package
in a PPA either. Surely there is a package I can install somewhere?

Thanks for your help,
-Mike
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