Firefox Quantum + userChrome.css

Better Together!

In addition to the built-in Customize feature (see Customize Firefox controls, buttons and toolbars at Mozilla Support), you can modify the appearance of Firefox using the powerful userChrome.css feature.

userChrome.css holds style rules for modifying Firefox's user interface. You can find users on the web offering a wide range of ready-to-paste style recipes, and communities where you can request help with rules to make your Firefox look just the way you want. And it's all free.

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