I can even run both at once as long as I launch the 2nd one from a link with the "-no -remote" command line switch to make sure it doesn't try to use the already-running process. I just have to make sure that the old profile is set as the default in the ProfileManager, and that I always launch the new Firefox with the new profile specified as a command line parameter (-p profilename). It works: I now have my old Firefox running with my original profile, and a new version of Firefox running with a new profile, without stepping all over each other. This method allows you to copy everything from the old 32-bit version of Firefox to a new copy, and then update only the new copy to the latest 64-bit version while keeping everything possible (many old plugins and extensions invalidated, of course). I finally got fed up with some web pages not working properly in my old and perfectly-set-up version of Firefox 47, and made the attempt to install a parallel new version without erasing my old version following this method.
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