# Per-Site CSS Injector

> Injects custom CSS to specific websites.

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

## Overview

- **ID:** `per-site-css-injector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** matt chavoshi
- **Category:** web-development,appearance,tabs
- **Daily users:** 16
- **Weekly downloads:** 1
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.0
- **Last updated:** 2025-11-04
- **First published:** 2025-11-01
- **Size:** 33 KB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/per-site-css-injector/)

## Description

The ultimate Custom CSS Injector extension allows you to effortlessly change the look and feel of any website by saving persistent custom styles for each domain. Key Features: * Site-Specific Styling: The CSS you define is only active for that specific domain (e.g., styles for <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c2fbbb33f75ef2f75a1d838fe17df76e838571799114bddb730d5574a4fdd01d/http%3A//grok.com" rel="nofollow">grok.com</a> will not affect <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/187ed18c48fe4e37708681edcdd7edf8bc86c3385debd75875ddac265b398f10/http%3A//gemini.google.com" rel="nofollow">gemini.google.com</a>). 
* Persistent Storage: Your styles are saved directly in the browser and are automatically applied every time you visit the site.
 * Easy-to-Use: Simply click the extension icon, enter your desired CSS code, and hit the save button.
 * Set It and Forget It: Once saved, you never have to repeat the process.

## Rankings

- #27,284 — Overall
- #139 — inject

## Permissions and access

### Permissions

- `activeTab`
- `storage`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate 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 has low user count. Unpopular extensions 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/per-site-css-injector)