You can enable them right now by setting sidebar.verticalTabs = true in about:config

Nope

One thing to note is it can be a bit tricky to get first party xbox one/series controllers to work wirelessly via bluetooth. Aside from that, xbox controllers work great. I don’t have any PS controllers, so I can’t personally speak to those, but they should work perfectly fine as well.

what’s wrong with man pages?

xtract ze vucking file