Can I have both the 32bit and 64bit versions of Firefox installed at the same time in 64bit Windows?

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