Firefox installation guide (Non snap)

[devemux86]

Way to avoid Snap version of Firefox and continue to use deb-package on freshly installed Ubuntu MATE 21.10

I have already prepared a draft titled "Ways to avoid Snap version of Firefox web browser". I'll put it below. Currently it is not needed, but let's save it for the near future. There are signs that modern Ubuntu versions will ship Firefox as a Snap. Some users will not accept this transition. So below are three possible alternatives - two deb-packaged and one for local user installation. At first we need to remove Snap'ed Firefox by command like: snap remove firefox --purge then at first…