At first, I thought this was another instance of FF opening up due to the default GUI that opened until I figured out what was happening.
There is a problem with this other 'Profile' folder being created, buried in the 'Users" folder running Win7. It is not a duplicate of the customized folder within the actual program folder, but just a 'default' profile folder that doesn't get updated when the regular profile changes (add ons, etc).
There are 3 folders (only one seems to have data in it) buried in that annoying 'Users' folder in Windows (W7 specifically).
What that causes is clicking on external URL links (in e-mails using client programs) if FF is not already running will open the browser using that default profile instead of the working profile producing a 'stock' looking GUI which is really annoying, as it might as well be a different browser (depending on how much customizing you have done).
Open the program by a desktop or start menu shortcut, it works as intended. I didn't try a another program by clicking the Help tab (that sometimes points to the developers website) to see if that would open FF using the default profile, duplicating clicking on a e-mail URL link.
Why and how on earth that buried default profile is used is beyond me and only with that one action.
So the question is, how can I makes changes (within reason) to point to the correct profile and also stop the program from creating those (what I consider) unnecessary/duplicate entries in the users folder?
BTW, just deleting those folders doesn't work, the program just recreates them again.