

Firefox is a commercial product. Is it not?
Well, it’s partially a matter of semantics. Perhaps different people have different understandings of the word ‘commercial’. For me, I’d say that Firefox is not something a user pays for. It’s existence is not about making a profit, or strengthening a business, or anything to do with money at all - and therefore it is not a commercial product.
I agree that the engineers should be paid, and that browser development is very difficult. But nevertheless, Firefox historically has not been about maximising a profit - or even making any kind of profit at all. (Although it does seem Mozilla leadership are looking to change that.)

I’m never really sure if I should be using /mnt, or /media, or neither, or both.
That’s just one of many things that I find a bit confusing about the main linux directories. Windows has many directory oddities too though. I guess that tends to happen when an old OS walks the fine line of maintaining backwards compatibility and conventions while expectations, needs, and best-practices gradually change over time.