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Firefox Custom UI Styling

A custom style kit for Firefox's internal pages and elements using userChrome.css and userContent.css. This stylekit customizes the generel appearance of Firefox.

Elements include (but not limited to):

  • Highlight colors
  • Sizes
  • Tabs
  • Urlbar
  • Inputs
  • Prompts (alert, confirm etc.)
  • about:preferences
  • about:config

Heavily inspired by Firefox proton design.
Hides some duplicate buttons and annoying features when using vertical tabs.

Automatic install

Note

Windows support
Windows support is limited, you must run this script from Windows Subsystem for Linux (WSL)

Important

Configuration flag required
You must manually set toolkit.legacyUserProfileCustomizations.stylesheets to true in about:config
Restart firefox after enabling this option.

The following command will attempt to automatically detect your Firefox profiles directory.
If it fails, proceed to manual installation below.

Command:
curl -sL https://raw.githubusercontent.com/allanrehhoff/ff-stylekit/refs/heads/master/install.sh | bash

Manual install

  1. Find your Firefox profile folder

    • Open about:profiles in Firefox
    • Look for the Root Directory of your active profile
    • Open it in your file explorer
    • Create a chrome folder if it doesn’t already exist

  2. Download contents

    • Clone contents of this repository to you machine
    • Copy the contents of the src/ folder and place it inside the chrome folder of your Firefox profile.

  3. Enable user stylesheets in Firefox

    • Go to about:config, then:
    • Set to true
    • Restart Firefox

Customizing colors

  1. Customize your accent color
    Open custom.css and change the values to your desired color codes.

  2. Restart firefox
    After changes, restart Firefox to apply the styles.