website/content/blog/firefox-dark-mode/index.en.md

---
title: "Firefox’ Dark Mode"
author: ""
date: 2021-05-15T11:54:53+02:00
categories:
tags:

draft: false
description: "How to enable the dark mode for all compatible websites in your Firefox."
slug: "firefox-dark-mode"
---

This is how to enable the dark mode for all compatible websites in your Firefox.

## Firefox Config

To enable the Firefox Dark Mode, open your Firefox' [about:config](https://support.mozilla.org/en-US/kb/about-config-editor-firefox) and add a **new** boolean `ui.systemUsesDarkTheme` and set it to `1`.

## Debugging

For debugging purposes, you can switch between dark and light mode using the *Inspector* (right-click → Inspect):

![dark and light mode in Firefox’ Inspector](2021-05-15_firefox-inspector-dark-light-mode.png)

You can test this right here on my website 🙂