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Customizing Firefox's interface with userChrome.css for compact mode and hidden tabs

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Firefox users can modify the browser's own interface using a userChrome.css file, a form of advanced customization most people don't need. The setup requires locating the profile folder via about:support, creating a chrome directory, and enabling a specific about:config flag before restarting. Example tweaks include hiding the horizontal tab bar for vertical tab setups, auto-collapsing the sidebar on hover, and restoring a compact layout density. Users can inspect UI elements with the Browser Toolbox, and userContent.css can similarly restyle web pages. The guide warns that changes may break after Firefox updates, since Mozilla alters internal selectors without notice.

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Customizing Firefox's interface with userChrome.css for compact mode and hidden tabs · ShortSingh