# Site CSS

> inject CSS on a per-site and per-page basis. Like Stylus but 200 lines of code.

Canonical page: [https://chrome-stats.com/d/site-css](https://chrome-stats.com/d/site-css)

## Overview

- **ID:** `site-css`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** twilligon
- **Category:** appearance
- **Daily users:** 1
- **Version:** 1.1
- **Last updated:** 2026-08-24
- **First published:** 2026-08-21
- **Size:** 18 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/site-css/)
- **Website:** [https://github.com/twilligon/site-css](https://github.com/twilligon/site-css)

## Description

<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/037e255a7685eb88125d17e4a0d5e4072709225f16f06be0f02a77b543cb5972/https%3A//github.com/twilligon/site-css" rel="nofollow">https://github.com/twilligon/site-css</a>

Inject CSS on a per-site and per-page basis. Like Stylus but 200 lines of code.

Click the extension icon to view and edit your overrides.
Add an override for a site (e.g. <code>*.example.com</code> or <code>example.com/docs/*</code>) or any <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/316f98a74319bf22d1ce71c84205c9cd30fa83e59a6ae2778b6ea36d65deda66/https%3A//urlpattern.spec.whatwg.org/" rel="nofollow">URL pattern</a> (e.g. <code>https://*.example.com/docs/*</code>).

## Rankings

- #90,121 — Overall
- #234 — site

## Permissions and access

### Permissions

- `scripting`
- `storage`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/site-css)