Mac: Can I add 3.6.23 after upgrading to 8.0.1 and run either one?

I upgraded but I am supporting a student who is enrolled at Agora Cyber Charter School in the k12 online school system. That program only supports Firefox 3.6.23 at the highest. I want to be able to run that older version when I go online for Agora purposes but run the latest version for other work. Is that possible on MacBook Pro?

A possible cause is a problem with the file places.sqlite that stores the bookmarks and the history.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.com/kb/Bookmarks+not+saved#w_places-database-file

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