DriftyDonN wrote:

Didnt know mozilla made versions for specific OEM.

They don’t, as far as I know, but Firefox is open source, so any OEM (or individual!) can take the code, modify it if they wish, compile it (perhaps with different options than the official Firefox build), and distribute it.  It could be that Acer modified it in some way, perhaps using an Acer program updater, or it could just be a stock Firefox build with that message added in. If it was modified in some way, Acer would have had to get permission to use the Firefox branding, and it would be up to Mozilla to decide whether the changes were acceptable for a Firefox-branded product or not.

Debian, the Linux distro that is the basis for Ubuntu, Mint, and many others, is fanatical about making sure that there’s no copyrighted content in their repos.  They initially had gotten permission, as far as I know, to distribute Firefox with the copyrighted art and logos removed, but Mozilla apparently changed its mind and decided that without the Firefox branding, it would not be acceptable to call it Firefox anymore.  The name of the Debian branch was changed to IceWeasel, and eventually IceCat.

Another option:
In situations like this, I only back up the prefs.js (in the FF profile folder, where all the customisations are held) and bookmarks and store elsewhere for re-introduction/import once ‘fresh/clean’ installation is done. Sometimes the profiles get screwed up in my experience. It will mean re-installing extensions which only costs a few minutes, and adjusting all the FF settings to your preference prior to importing bookmarks and overwritting existing prefs.js
This method has worked flawlessly for me over many years. YMMV

You haven’t given us any results of a search for Firefox.exe.

My guess while we wait for further details is that both entries refer to the same folder because of some bug caused by one of the installers/updaters triggering an errant Registry entry (eg: a new one was added when it should have replaced the earlier one), it’s something I’ve seen before – if you do a simple (not full) uninstall of the older ‘version’ it will remove them both. Ignoring it is easiest.

On the Tor comment above, almost certainly irrelevant as that should be installed on the Desktop and it doesn’t show in (add/remove) Programs list, uninstalling it consists of simply deleting the folder.

It would seem that you have both a 32-bit and 64-bit version, only one of which has been updated.

Or… you have two 64-bit versions, one in each program folder, and only one updated?

DriftyDonN wrote:

I dont get why ff needs to update so often

Reading this may curl the hair explain why …
Security Advisories for Firefox

😉