Firefox Focus is also a lovely little mobile browser for random queries and such. It's effectively always in private browsing mode; anytime you close it, it clears its cache.
I definitely use it more often than "regular" Firefox on mobile. I only really use regular Firefox if I need some sort of persistence or login.
Are you trying to build up a giga shit, so you can clog your nemesis's toilet?
I mean, if the quality of content on the site currently is any indication of how things will look like going forward, I think maybe ditching reddit will be easier than I thought. it's wayyyyyyy more reactionary than usual, though I think there's some 4chan-originated pot-stirring going on. still though, it's not a pleasant place to be right now.
In my experience, it doesn't actually delete everything. You might need to make multiple passes to get the really old stuff. My account is VERY old though (almost 18 years. I was an early adopter)
Don't forget Red Star Linux!