Hello, Sadly, no. You can have only one version of Firefox installed. More information about this can be found [https://support.mozilla.org/nl/questions/1099854 here].

I don't think that it would be a problem to install both the 64 bit and the 32 bit Firefox release as they can be installed in different folders. You will only have to do a custom install and make sure to install each version in the correct location. *(32 bit Windows) "C:\Program Files\Mozilla Firefox\" *(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\" Make sure not to launch Firefox, but create a separate profile for each version. Add a space and -P "<profile_name>" to the desktop shortcuts to start each version with its own profile. See: *http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_windows *http://kb.mozillazine.org/Shortcut_to_a_specific_profile *https://developer.mozilla.org/Mozilla/Multiple_Firefox_Profiles