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Enable dark mode on Firefox


Author: Solène

Date: 04 May 2020

Tags: firefox


Comment on Mastodon


Some websites (like this one) now offers two differents themes: light and dark.


Dark themes are proven to be better for the eyes and reduce battery usage on

mobiles devices because it requires less light to be displayed hence it

requires less energy to display. The gain is optimal on OLED devices but it

also works on classic LCD screens.


While on Windows and MacOS there is a global setting for the user interface in

which you choose if your system is in light or dark mode, with that setting

being used by lot of applications supporting dark/light themes, on Linux and

BSDs (and others) operating systems there is no such settings and your web

browser will keep displaying the light theme all the time.


Hopefully, it can be fixed in firefox as [as explained in the

documentation](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-color-scheme).


To make it short, in the about:config special Firefox page, one can create a

new key `ui.systemUsesDarkTheme` with a number value of `1`, the firefox

about:config page should turn dark immediately and then Firefox will try to use

dark themes when they are available.


You should note that as explained in the mozilla documentation, if you have the

key `privacy.resistFingerprinting` set to `true` the dark mode can't be used.

It seems dark mode and privacy can't belong together for some reasons.


Many thanks to [https://tilde.zone/@andinus](https://tilde.zone/@andinus) who

pointed me this out after I overlooked that page and searched a long time with

no result how to make Firefox display website using the dark theme.

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