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Q&A Control whether Firefox renders web pages in dark or light mode

According to this support answer to "Home page is black", Enter about:config in the address bar. Edit the value of "layout.css.prefers-color-scheme.content-override" to 0 to use a dark b...

posted 2y ago by Quasímodo‭  ·  edited 2y ago by Quasímodo‭

Answer
#5: Post edited by user avatar Quasímodo‭ · 2022-03-02T15:37:05Z (over 2 years ago)
  • According to [this support answer to "Home page is black"][0],
  • 1. Enter `about:config` in the address bar.
  • 2. Edit the value of "layout.css.prefers-color-scheme.content-override" to
  • ```
  • 0 to use a dark background
  • 1 to use a light background
  • 2 to follow the system GTK theme
  • 3 to follow the browser toolbar theme
  • ```
  • Some notes:
  • - [The option is not documented yet.][1]
  • - Since few web pages offer a dark mode, don't expect
  • this to affect many of them. If you want to force a dark background for any page, there are several add-ons for that, for example [Dark Reader][2].
  • - If you choose `2` and use a global dark theme on KDE, you also need to set a dark GTK theme in the settings manager (_Application style > GNOME/GTK application style_). Choosing only the global theme as dark will have no effect on Firefox, because the former is Qt based and the latter GTK based.
  • [0]: https://support.mozilla.org/en-US/questions/1363994
  • [1]: https://firefox-source-docs.mozilla.org/browser/urlbar/preferences.html
  • [2]: https://github.com/darkreader/darkreader
  • According to [this support answer to "Home page is black"][0],
  • 1. Enter `about:config` in the address bar.
  • 2. Edit the value of "layout.css.prefers-color-scheme.content-override" to
  • ```
  • 0 to use a dark background
  • 1 to use a light background
  • 2 to follow the system GTK theme
  • 3 to follow the browser toolbar theme
  • ```
  • Some notes:
  • - [The option is not documented yet.][1]
  • - It doesn't work if "privacy.resistFingerprinting" is true.
  • - Since few web pages offer a dark mode, don't expect
  • this to affect many of them. If you want to force a dark background for any page, there are several add-ons for that, for example [Dark Reader][2] and [Midnight Lizard][3].
  • - If you choose `2` and use a global dark theme on KDE, you also need to set a dark GTK theme in the settings manager (_Application style > GNOME/GTK application style_). Choosing only the global theme as dark will have no effect on Firefox, because the former is Qt based and the latter GTK based.
  • [0]: https://support.mozilla.org/en-US/questions/1363994
  • [1]: https://firefox-source-docs.mozilla.org/browser/urlbar/preferences.html
  • [2]: https://github.com/darkreader/darkreader
  • [3]: https://github.com/Midnight-Lizard/Midnight-Lizard
#4: Post undeleted by user avatar Quasímodo‭ · 2022-03-01T17:19:50Z (over 2 years ago)
#3: Post edited by user avatar Quasímodo‭ · 2022-03-01T17:18:15Z (over 2 years ago)
  • According to [this support answer to "Home page is black"][0],
  • 1. Enter `about:config` in the address bar.
  • 2. Edit the value of "layout.css.prefers-color-scheme.content-override" to
  • ```
  • 0 to use a dark background
  • 1 to use a light background
  • 2 to follow the system theme
  • 3 to follow the browser toolbar theme
  • ```
  • [The option is not documented yet.][1]
  • I want to stress that few web pages offer a dark mode, so don't expect
  • this to affect many of them. If you want to force a dark background for any page, there are several add-ons for that, for example [Dark Reader][2].
  • [0]: https://support.mozilla.org/en-US/questions/1363994
  • [1]: https://firefox-source-docs.mozilla.org/browser/urlbar/preferences.html
  • [2]: https://github.com/darkreader/darkreader
  • According to [this support answer to "Home page is black"][0],
  • 1. Enter `about:config` in the address bar.
  • 2. Edit the value of "layout.css.prefers-color-scheme.content-override" to
  • ```
  • 0 to use a dark background
  • 1 to use a light background
  • 2 to follow the system GTK theme
  • 3 to follow the browser toolbar theme
  • ```
  • Some notes:
  • - [The option is not documented yet.][1]
  • - Since few web pages offer a dark mode, don't expect
  • this to affect many of them. If you want to force a dark background for any page, there are several add-ons for that, for example [Dark Reader][2].
  • - If you choose `2` and use a global dark theme on KDE, you also need to set a dark GTK theme in the settings manager (_Application style > GNOME/GTK application style_). Choosing only the global theme as dark will have no effect on Firefox, because the former is Qt based and the latter GTK based.
  • [0]: https://support.mozilla.org/en-US/questions/1363994
  • [1]: https://firefox-source-docs.mozilla.org/browser/urlbar/preferences.html
  • [2]: https://github.com/darkreader/darkreader
#2: Post deleted by user avatar Quasímodo‭ · 2022-03-01T14:10:00Z (over 2 years ago)
#1: Initial revision by user avatar Quasímodo‭ · 2022-03-01T14:01:43Z (over 2 years ago)
According to [this support answer to "Home page is black"][0],

1. Enter `about:config` in the address bar.

2. Edit the value of "layout.css.prefers-color-scheme.content-override" to

```
0 to use a dark background
1 to use a light background
2 to follow the system theme
3 to follow the browser toolbar theme
```

[The option is not documented yet.][1]

I want to stress that few web pages offer a dark mode, so don't expect
this to affect many of them. If you want to force a dark background for any page, there are several add-ons for that, for example [Dark Reader][2].

[0]: https://support.mozilla.org/en-US/questions/1363994
[1]: https://firefox-source-docs.mozilla.org/browser/urlbar/preferences.html
[2]: https://github.com/darkreader/darkreader