Install multiple version of Firefox, each with it's own local profil

How-to_multiple_firefox_versions.txt

Start firefox with an other Profile:
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That will still change things on you user directory (~/.mozilla/firefox/ProfileName)

% ./firefox --no-remote -P ProfileName


Start firefox bypassing the profil manager:
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% ./firefox --no-remote -profile path_to_directory

path_to_directory may be empty, it will be populated as neeeded. 
More information: http://kb.mozillazine.org/Bypassing_the_Profile_Manager


Downloading old versions of Firefox:
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Because firefox web site make it really hard to find it:

https://ftp.mozilla.org/pub/mozilla.org/firefox/releases



Full example for local Firefox 31.4esr:
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% wget https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/31.4.0esr/linux-x86_64/en-GB/firefox-31.4.0esr.tar.bz2
% tar xjf firefox-31.4.0esr.tar.bz2
% cd firefox
% mkdir local-profil
% ./firefox --no-remote -profile local-profil