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Firefox UI customization

Changing Firefox interface with userChrome.css and userContent.css.

Latest update was for version 78.0b4.

Features

• centered address in urlbar
• floating centered findbar on the top of the page
• subtle tab separators
• tab close button visible only on hover
• unnecessary buttons removed
• context menus cleaned up
• dark thin scrollbars
• dark JS alerts/prompts
• dark viewsource and error pages
• bookmarks bar on newtab page on hover
• background image on newtab page
• floating navbar in fullscreen mode
• compact addons overflow menu

Some colors might be hardcoded to match the theme I use (ArcDark).

Installation

1. Open your profile from about:support > Profile Folder.
2. Inside create a folder named chrome.
3. Copy contents of this repository into this chrome folder.

Comment out @import lines in userChrome.css and userContent.css to disable certain tweaks. Such as

/*@import url('userContent/about_newtab.css');*/

Examples

Photo by Osman Rana on Unsplash

Min/max/close buttons stand out because on my Windows 8.1 they are controlled by OS and cannot be changed by Firefox.

Other great custom Firefox UI projects

• Firefox csshacks
• UserChrome Tweaks
• Quantum Nox
• CustomCSSforFx