Site CSS

Inject CSS per URL

Site CSS is a minimal extension to apply custom user CSS to sites and pages you visit. Add a URL pattern (matching every page, a host, a specific page, or anything in between), paste in some CSS, and it applies every time you visit. Site CSS does the Right Thing whenever possible: - Extremely minimal, auditable implementation (no dependencies, build steps, or built-in autoformatters here) - Styles sync via your browser profile and update live as you edit - Styles apply before document load with no flash of unstyled content - Styles are injected as user-origin CSS as in the halcyon days of `userContent.css`: Site CSS rules < page rules < page `!important` rules < Site CSS `!important` rules - Efficient filter implementation so pages without custom styles don't slow down - Works in iframes and on file:// urls - No account, no tracking, no data collection - Open source and public domain (CC0): https://github.com/twilligon/site-css