May I also suggest that you modify Help > About Firefox to display which version (32 or 64 bit) the user is running? You might not think it's important, but for many end users, it is.
May I suggest that you modify the install procedure to mention 64 bit somewhere, so the user has some comfort as to what they are about to install on their system. The program should be telling me, giving me some indication of what it's done. Do I really have to examine the properties of my Firefox shortcut to figure out which folder it's going to run it from? That's not really feedback is it? Because once launched how do I know that it hasn't decided for me which version to run? Feedback. No pages will load after installing Mozilla 57.0.4 from 55.0 Im trying to open Firefox and all my tabs are blanc and they have no address typed. There is a slight clue that once installed there is a Mozilla Firefox directory in Program Files, but I note that the old Firefox folder in Program Files (x86) has not been tidied up. And then the install procedure does not then mention 64 bit at all.
When I looked at installing 64 bit Firefox, I noticed that the download filename for the Windows 32bit and 64bit versions are EXACTLY THE SAME. They need that crumb of comfort that tells them that what they have done has succeeded - without having to post questions on this board. One that should be really easy for you guys to fix. While it is quite splendid that you are able to tell that the OP has indeed posed his question with his 64 bit version of Firefox, the fact that he even has to ask points out a flaw in Firefox.