The whole firefox controversy was overblown. Hardened firefox is still the way to go.

anarcho-communist, arch

you can actually! either with lutris or by adding it as a non-steam game on steam

file managers such as dolphin or thunar should have that option built-in

midnight lizard worked great last time I checked it

breaking websites is a good thing actually, as it disables any and all javascript and webgl tracking (and you can unbreak a website anyway if you really need javascript for it to function)

ublock origin and umatrix, anything else only makes you more fingerprintable