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How to install a specific firefox version
I just faced the problem of having to use firefox 7.0.1 in ubuntu 10.04. Not easy at all! By default it comes with the old 3.6 version. You can install the ubuntu mozilla stable ppa and get a newer version from there, but it's currently providing firefox 9.0.1 and selenium does not support it yet.
After trying to install a lower version from the ppa, pinning packages and trying to install the download package manually, the only working way I get was to download the source code and execute it directly.
More consice instructions can be found here:
http://askubuntu.com/questions/83227/how-can-i-install-a-specific-older-version-of-firefox-and-keep-it-from-automatic
And you can download the source from the official ftp, for example the mentioned version:
ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/7.0.1/linux-i686/en-GB/