Firefox may soon paint all sites in dark or light mode, if you want


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Malware Hunter
Aug 17, 2014
Mozilla is working on a new feature in the organization's Firefox web browser that may be used to force a specific color scheme on sites you visit.

Most browsers support light and dark modes already, but the functionality is limited to painting the chrome of the browser using the color scheme. Website content remains unmodified when the feature is enabled or configured.

The latest Firefox Nightly, version 96.0a1, comes with a new feature that extends the functionality. Once activated, sites will also be displayed in the selected color scheme.

Here is how the feature looks on Ghacks. Dark Mode was enabled on the Windows 10 system and Firefox picked it up to display the browser UI and the content of the webpage using the color scheme.
All sites are displayed using the selected mode and color scheme. Firefox includes options to change some parameters, including text and background colors.

Here is how you configure the feature in Firefox Nightly:
  1. Select Menu > Settings.
  2. Scroll down to the Language and Appearance section.
  3. Activate the "Colors" button on the page.
mozilla-firefox enable dark mode

Here you get the following options:
  • To configure the force color feature on websites, set "Override the colors specified by the page with your selections above" to Always.
  • Change the text and Background colors to your liking.
  • Change the visited and unvisited links colors as well.
  • Select OK to save the new configuration.
Websites will be painted using the selected mode of the operating system, light or dark, and the colors selected in Firefox's preferences.
The feature was announced by Mozilla employee Morgan on Twitter. According to the information posted there, users should expect that some content may not look perfect when the forced colors mode is enabled. Users are encouraged to report bugs and issues on Bugzilla.

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Level 25
Top poster
Sep 26, 2017
Not exactly a new feature, is just making an option that already exists automatic.

This dates back to IE days if you knew were to look.
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