Re: @Ian Google are cunts
Firefox is generally alright on the desktop. On Android it's awful.
I'm running Fennec on my original (early 2014) MotoG under LineageOS with the same add-on mix (NoScript/PrivacyBadger/HTTPSEverywhere) as Firefox on the desktop. It's a bit slow, and the 1GB RAM does mean that multiple tabs end up being 'paged out' and reloading when you switch back, but it seems perfectly usable other than being a little tight on screen space in my prefered layout. On my son's much newer MotoG5s (or whatever it is) with faster processor and a lot more RAM, it's an almost desktop-like experience.
M.