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

It has been reported that, if on a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo does, but Codidact doesn't) in dark mode. How can I better contro...

1 answer · posted 2y ago by Quasímodo‭ · last activity 2y ago by Quasímodo‭

Question firefox

#4: Post edited by

Quasímodo‭ · 2022-03-01T17:19:43Z (over 2 years ago)
Revert to initial question since the proposed solution actually works

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It has been [reported][1] that, if on a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo does, but Codidact doesn't) in dark mode.
How can I better control how Firefox behaves in respect to that?
~~I followed these steps according to [this support answer to "Home page is black"][2]:~~
~~1. Entered about:config in the address bar.~~
~~2. Edited the value of "layout.css.prefers-color-scheme.content-override" to 0, the options being~~
~~```~~
~~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~~
~~```~~
~~But I still get pages that support dark mode in light mode.~~
~~[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode~~
~~[2]: https://support.mozilla.org/en-US/questions/1363994#answer-1473215~~

It has been [reported][1] that, if on a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo does, but Codidact doesn't) in dark mode.
How can I better control how Firefox behaves in respect to that?
[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode

#3: Post edited by

Quasímodo‭ · 2022-03-01T16:06:55Z (over 2 years ago)

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~~It has been [reported][1] that if one use a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo) in dark mode.~~
How can I better control how Firefox behaves in respect to that?
I followed these steps according to [this support answer to "Home page is black"][2]:
1. Entered about:config in the address bar.
2. Edited the value of "layout.css.prefers-color-scheme.content-override" to 0, the options being
```
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
```
But I still get pages that support dark mode in light mode.
[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode
[2]: https://support.mozilla.org/en-US/questions/1363994#answer-1473215

It has been [reported][1] that, if on a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo does, but Codidact doesn't) in dark mode.
How can I better control how Firefox behaves in respect to that?
I followed these steps according to [this support answer to "Home page is black"][2]:
1. Entered about:config in the address bar.
2. Edited the value of "layout.css.prefers-color-scheme.content-override" to 0, the options being
```
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
```
But I still get pages that support dark mode in light mode.
[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode
[2]: https://support.mozilla.org/en-US/questions/1363994#answer-1473215

#2: Post edited by

Quasímodo‭ · 2022-03-01T14:14:51Z (over 2 years ago)
Add non-working solution

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It has been [reported][1] that if one use a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo) in dark mode.
How can I better control how Firefox behaves in respect to that?
[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode

It has been [reported][1] that if one use a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo) in dark mode.
How can I better control how Firefox behaves in respect to that?
I followed these steps according to [this support answer to "Home page is black"][2]:
1. Entered about:config in the address bar.
2. Edited the value of "layout.css.prefers-color-scheme.content-override" to 0, the options being
```
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
```
But I still get pages that support dark mode in light mode.
[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode
[2]: https://support.mozilla.org/en-US/questions/1363994#answer-1473215

#1: Initial revision by

Quasímodo‭ · 2022-03-01T13:59:14Z (over 2 years ago)

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Control whether Firefox renders web pages in dark or light mode

It has been [reported][1] that if one use a dark theme in KDE, Firefox automatically renders some websites that support it (e.g. Duckduckgo) in dark mode.

How can I better control how Firefox behaves in respect to that?

[1]: https://unix.stackexchange.com/questions/692545/firefox-starts-most-websites-in-dark-mode

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