In this PC tutorial, I show you exactly how to enable Dark Mode in the Mozilla Firefox web browser on Windows—no fluff, just the clicks you need. I start by opening Firefox, heading to the upper-right 3-bar hamburger menu, and jumping into Settings. From there, I stay on the General tab and scroll down to the Website Appearance section, where Firefox gives you a few choices. If you want Dark Mode for web pages, you simply toggle on “Dark.” After that, I cover the second part people miss: the browser interface theme. Right under Website Appearance, I click “Manage Firefox Themes in Extensions & Themes,” which takes you to the themes page. If you’re still on Light, you can pick a dark theme (or search for one) and enable it—then your tabs and toolbar switch over too. Once it’s on, I even hop back to a site like YouTube and refresh so you can see the change in action.