Best I can offer is a ruby icon

TIL you can actually use about:reader?url=https://some-random-url to get it basically anywhere!

Reader mode ftw

Edit: it also supports dark mode

Wholeheartedly agree, but most people wont do it, so you end up with signal for 1 or 2 friends, telegram for a few others, and all the crap ones for the rest (whatsapp, slack, teams, messenger, etc)

Ive ditched every messaging app but signal and telegram, and its really annoying sometimes