Feature: "request desktop version"
Created by: doniks
Firefox on Android has a very helpful menu: "Request desktop site"
You can tick it in a tab and then the website switches from mobile view to desktop view. For example on github. I find it to be a very helpful for misbehaving websites. E.g., things that are not (easily) possible on a mobile site.
NB: Yes, some websites have their own toggles to switch to desktop mode, but then I sometimes had problems finding a way to switch back.