KeyFox is A simple, minimal OneLiner Keyboard-centered CSS for Firefox. Brave-Fox is a Firefox Theme that brings Brave's design elements into Firefox. A Firefox theme, which features gentle curves, transparency and a minimal interface.

Apr 1, 2025 · What does userChrome.css do? Firefox’s user interface is built of web-like elements (HTML and XUL elements) and styled using CSS. Users can set Firefox to look for a userChrome.css file at startup, so the rules in the file can restyle various elements of the user interface.

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.

Aug 15, 2021 · I literally just stumbled onto your tutorial after Firefox forced everyone onto Proton. Incredibly handy guide to start dabbling with Firefox CSS. Thanks!

Sep 2, 2017 · Firefox supports advanced customization of its UI with user-defined CSS. This allows virtually unlimited customization of the style of the browser, as well as some very limited functionality customization. You can define these rules in two files, userChrome.css and userContent.css.

A collection site of Firefox userchrome themes, mostly from FirefoxCSS Reddit community.

Sep 2, 2017 · People come here to get help with and learn about Firefox CSS. Posts and comments should be about Firefox customization with CSS.

Apr 10, 2025 · A vendor prefix is used to indicate that a feature is specific to a certain browser. Firefox supports several extensions to CSS, which are prefixed with -moz-.

May 11, 2025 · Custom CSS to make the web transparent, beautiful and zen. Main style repo for the Zen Internet add-on. Minimal theme & startpage for geek people. Monochromatic & pastel colors. Keyboard centered. A simple, online, minimal, keyboard-centered Firefox CSS theme.

Firefox Quantum 's interface is still extremely customizable thanks to its userChrome.css file. You can edit this file to hide unwanted menu items, move the tab bar below the navigation toolbar, …