# javascript

> add javascript that will run on this domain. back up your scripts in the options area (shortcut there by clicking the "JS" letters in the bottom right)

Canonical page: [https://chrome-stats.com/d/javascript?hl=fr](https://chrome-stats.com/d/javascript?hl=fr)

## Overview

- **ID:** `javascript`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** chee
- **Category:** web-development,other
- **Daily users:** 11,648
- **Weekly downloads:** 160
- **Rating:** 4.27 / 5 (60 ratings)
- **Version:** 0.4.0
- **Last updated:** 2023-03-01
- **First published:** 2018-10-05
- **Size:** 386 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/javascript/)
- **Website:** [https://chee.party](https://chee.party/)

## Description

The **JavaScript Injector** Chrome extension allows users to effortlessly add and execute custom JavaScript on specified domains. With an intuitive interface, you can assign scripts to run on every page within a domain, enhancing your browsing or development experience.

Key features include the ability to save scripts, easy backup options accessible through a convenient shortcut (clicking the “JS” icon at the bottom right), and seamless execution of your JavaScript code across any domain. This tool is perfect for developers, testers, or advanced users who want to customize web behavior or automate tasks browser-wide.

## Rankings

- #717 — Overall
- #63 — Web Development
- #97 — Other extensions
- #1 — javascript
- #17 — script
- #110 — domain

## Permissions and access

### Permissions

- `activeTab`
- `storage`
- `unlimitedStorage`

### Content script matches

- `*`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low 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 medium 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).

## Review summary

Overall, reviews praise the add-on for ease of use, power, and a Stylus-like workflow that makes managing JavaScript on pages approachable. The main benefit is enabling user scripts without Mozilla submission and enabling automation like auto-scrolling, as well as content blocking. Reported drawbacks are relatively minor and not widespread, with occasional site compatibility issues and a small editor quirk noting that an empty script save can occur, plus occasional local-file limitations mentioned by some users. The sentiment is largely positive, emphasizing versatility and convenience for customizing page behavior with JS.

### Pros

- Easy to use and user-friendly interface.
- Very powerful and flexible for injecting JavaScript on pages, including automation (e.g., auto-scrolling) and blocking content.
- Stylus-like workflow for JavaScript, familiar to CSS users.
- Convenience features: can load personal scripts without Mozilla submission and supports auto-loading bookmarklets.

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- [MyJs](https://chrome-stats.com/d/myjs)
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Source: [Chrome-Stats](https://chrome-stats.com/d/javascript?hl=fr)