How are you locked out of Firefox?

The key folders are:

C:\Program Files\Mozilla Firefox

C:\Users\<username>\AppData\Roaming\Mozilla\Firefox (WORTH BACKING UP)

C:\Users\<username>\AppData\Local\Mozilla\Firefox

Actually, just like this...

https://support.mozilla.org/en-US/questions/1479604

And yes, I do have the folders worth backing up, on both profiles, if need be.

EDIT... In the process of trying to remove everything on the computer associated with Firefox, I've come across the need to get permission from the supposed "TrustedInstaller" before I'm allowed to delete the last few files, am looking at the Advanced Security Settings of Firefox browser file I'm trying to take control of, but don't really understand how to change the ownership or allow the permission. It does have "full control".

Obviously you are a very knowledgeable user, but if you don't slow down, you are going to make recovery impossible.

Please see my forthcoming reply in the other thread.