# CSS and JS Injector

> Injects custom CSS and JavaScript into specified websites to change their look

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

## Overview

- **ID:** `css-and-js-injector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Ashutosh
- **Category:** web-development,appearance
- **Daily users:** 5
- **Version:** 1.1
- **Last updated:** 2025-08-31
- **First published:** 2025-05-13
- **Size:** 26 KB
- **Data as of:** 2026-09-10
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/css-and-js-injector/)

## Rankings

- #45,013 — Overall
- #230 — inject

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `<all_urls>`

### 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/css-and-js-injector)