UserCSS/Styles/Firefox/README.md

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Note: Download your desired CSS file from this repo and rename it as userChrome.css (important).

How to use a userChrome.css theme

  1. Type about:config into your URL bar. Click on the I accept the risk button if you're shown a warning.
  2. Seach for the following values and set them to true:
    • toolkit.legacyUserProfileCustomizations.stylesheets
    • layers.acceleration.force-enabled
    • gfx.webrender.all
    • svg.context-properties.content.enabled
    • browser.compactmode.show
  3. Go to your profile folder:
    • Linux: $HOME/.mozilla/firefox/######.default-release/
    • MacOS: Users/[USERNAME]/Library/Application Support/Firefox/Profiles/######.default-release
    • Windows: C:\Users\[USERNAME]\AppData\Roaming\Mozilla\Firefox\Profiles\######.default-release
  4. If it doesn't exist already create a folder called chrome.
  5. Copy your desired userChrome.css into that folder.

This guide is borrowed from the Cascade repo. Credits: github.com/andreasgrafen/cascade