javascript

Name: javascript
Rating: 4.2667 (60 reviews)
Author: chee

By: chee

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)

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Features & Capabilities

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.

User Growth & Download Statistics

Add-on Developer Tools

By:

chee

Daily users:

11,870 151

Rating:

4.27

(60)

Version:

0.4.0 Last updated: 2023-03-01

Version code:

5530543

Creation date:

2018-10-05

Risk:

Permissions:

Content scripts matches:

Size:

385.99KB

Email:

ad*****@chee.party

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 700 ▲ 6

Other rankings

#60 in Web Development ▼ 1#100 in Other extensions ▲ 1#1 in javascript keyword 45 #18 in script keyword 28 #100 in domain keyword 26 ▲

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

chee

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/javascript/

Email:

ad*****@chee.party

Website:

https://chee.party

User Reviews

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.

Cons

Recent reviews

by Ha*****, 2026-02-19

Very good. But I'd like to know if it's possible to create a script that runs on all pages. I'd like to implement a dark mode that activates when a button is pressed. Also, I'd like to know if it's possible to specify the DOM tag when adding the script. I was using a polyfill, but since it runs last, I had to reload the other scripts for them to run without errors.

by da*****, 2026-01-12

I had a small extension I wrote for myself modifying a site to my preferences and was annoyed I could only load it as a temporary extension without submitting it to Mozilla. This is exactly what I needed, thank you.

by R.*****, 2025-07-10

View all user reviews ›

Is javascript Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

javascript requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

javascript has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
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