Dark mode is all the rage these past few years, with nearly all operating systems and applications now offering the feature. Mozilla Firefox is no exception, and it's pretty simple to enable dark mode inside the web browser. This can help reduce eye strain, especially when using your PC in a dimly lit room.

In this guide, we'll take you through the step by step instructions to enable dark mode in Firefox on a Linux system. You'll also see how to select from a variety of other themes or restore the classic brighter theme.

In this tutorial you will learn:
  • How to enable or disable dark mode (and other themes) in Firefox
Dark theme enabled on Mozilla Firefox
Dark theme enabled on Mozilla Firefox
Software Requirements and Linux Command Line Conventions
Category Requirements, Conventions or Software Version Used
System Any Linux distro
Software Mozilla Firefox
Other Privileged access to your Linux system as root or via the sudo command.
Conventions # - requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command
$ - requires given linux commands to be executed as a regular non-privileged user

Enable Dark Mode

Firefox uses "themes" to customize the colors of the web browser's user interface. Therefore, there isn't technically any "dark mode" in Firefox, rather we'll just be changing to a dark theme.

Follow along with the step by step instructions below to enable the dark theme in your Firefox installation.

  1. Start by opening Firefox, clicking the menu icon (three stacked lines in the upper right corner), and selecting Add-ons.

    Open the Add-ons menu to change your theme
    Open the Add-ons menu to change your theme

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  3. Click on Themes on the left side of this window, and scroll down partially to see the dark theme. You can enable it by clicking the enable button next to it.

    Enable the dark theme
    Enable the dark theme
  4. These same instructions can be used for re-enabling the default theme, selecting a different preloaded theme, or even building your own theme with custom colors and the Firefox Colors add-on.

    Choose from other popular themes or build your own if you are not satisfied with the dark theme
    Choose from other popular themes or build your own if you are not satisfied with the dark theme

That's all there is to it. The changes will be instantly applied and you can resume your browsing activities as normal. If you have Firefox Sync enabled, your installations of Firefox on other devices will also reflect the new change.

Conclusion

In this guide, we saw how to enable dark mode/theme in Firefox on a Linux system. Dark mode is easier on the eyes, and many users just think that it looks better. Whatever your preferences are for colors, Firefox makes it a breeze to change them.

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