Site CSS

by twilligon · twilligon.com · Functionality & UI

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Inject CSS per URL

Users

+12 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#164K

#137K among extensions

Version

1.1

updated 24 Aug 2026

Users

monthly, 2 months

Latest, 16 Oct 2026: 16 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 months

Latest, 16 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About Site CSS

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