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TIL protonmail lets you use custom css (haven't played with it tho)
@emsenn You can use custom css for FireFox too.
@emsenn I use this dark theme: https://overdodactyl.github.io/ShadowFox/
its pretty cool and easy on the eyes. Also easy to install
@emsenn If you are using windows there is bug on installation, but its reported on github.
@johny I've heard! I've only just learned to do any CSS, so am not keen on messing with any websites, but it's always cool to see software service providers that offer it built-in.