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How do I force Firefox to show a website in dark mode?

Published in Firefox Dark Mode 2 mins read

To set your preference for websites to appear in dark mode using Firefox's built-in settings, you need to adjust the appearance options in the browser's preferences.

Setting Your Preferred Color Scheme

Firefox allows you to specify your preferred color scheme for websites that support adapting to user preferences. This setting tells websites whether you prefer a light or dark theme.

Follow these steps to configure your dark mode preference in Firefox, based on the provided reference:

  1. Locate the Menu bar at the top of the screen.
  2. Click Firefox and then select either Preferences (if you are on macOS) or Settings (depending on your macOS version).
  3. In the left-hand menu, navigate to the General panel.
  4. Scroll down the General settings until you find the section titled Language and Appearance.
  5. Under the "Website appearance" or similar heading within this section, you will find options to Select the color scheme you want to use for the websites you visit. Choose the "Dark" option.

Setting this preference signals to websites supporting the prefers-color-scheme CSS media query that you prefer a dark interface. Many modern websites will automatically switch to their dark theme when they detect this setting.

Note: While this method sets your preference for dark mode, it does not strictly force every single website to appear dark. Websites that do not support the prefers-color-scheme media query or that use specific styling overrides may not change their appearance. For such sites, other methods like browser extensions would be required, but the steps above detail the official setting within Firefox itself.

By adjusting this setting in your Firefox preferences, you are instructing the browser to communicate your preference for a dark color scheme to compatible websites, enhancing your browsing experience on many sites.

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