Custom JavaScript for Websites

5.0 (

3 ratings

)

Extension Accessibility 1,000 users

Item media 1 (screenshot) for Custom JavaScript for Websites

Item media 2 (screenshot) for Custom JavaScript for Websites

Overview

Inject custom JS into the current domain.

Custom JS Injector allows you to run your own JavaScript code on any website. You can write, inject, and store custom scripts per domain — all from a clean, intuitive popup interface. ✨ **Features**: - 💻 Inject JavaScript into any website via popup UI - 💾 Automatically saves your script per domain - 🔁 Auto-inject on page reload — no need to click again - 🔒 Scripts are stored locally (no remote sync or upload) - 🧠 No external dependencies, no bloat — just pure custom JS! 🚀 **Use Cases**: - Debug page behavior or experiment with ideas - Clean up UI or hide elements - Extract data from web apps or dashboards - Apply personal UI/UX fixes on internal tools 📝 **Important Notice – Website Restrictions**: This extension **does not work** on some websites that actively block JavaScript injection through browser-level security mechanisms like **Content Security Policy (CSP)**. These websites include, but are not limited to: - `google.com` - `facebook.com` - `twitter.com` - `chrome.google.com` Due to these restrictions, the extension’s inject feature will **not function** on those sites. This is expected behavior, and not a bug or issue with the extension. To test or use this extension, please try it on other websites that do not have strict CSP rules — such as: - `example.com` - `wikipedia.org` - internal tools or custom dashboards 📌 **Privacy**: This extension only uses local storage. **No data is shared, synced, or uploaded remotely.**

5 out of 5 3 ratings
Learn more about results and reviews.

Details

Version

1.04
Updated

March 9, 2026
Flag concern
Offered by

QP
Size

1.89MiB
Languages

English (United States)
Developer

Que Pham

Email

phamque.adnetplus@gmail.com
Non-trader

This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization

The developer has disclosed that it will not collect or use your data.

This developer declares that your data is

Not being sold to third parties, outside of the approved use cases
Not being used or transferred for purposes that are unrelated to the item's core functionality
Not being used or transferred to determine creditworthiness or for lending purposes

Run Javascript

4.1

Run custom Javascript, each time you visit a website

Inject JS - Run JavaScript code

4.9

Inject js on any website Run JavaScript code

Inject Code

4.6

Inject your own Javascript, React/JSX, CSS / LESS / SCSS/ SASS into any webpage

InjectJS – JavaScript Injector & Custom Script Manager

4.6

Inject custom JavaScript (JS) into any webpage, automate tasks, and manage scripts. Ideal for developers and power users.

User JavaScript and CSS

4.8

User JavaScript and CSS on any website

exec JavaScript

3.3

Inject your own JS code on any website

JavaScript Tools

5.0

Easily run code snippets on any website quickly!

Custom Site JS

5.0

Run your own (per url or domain) custom JavaScript on sites.

Scripty - Javascript Injector

3.8

Inject your Javascript into the webpage

Kode Injector

0.0

Helps to inject JavaScript and CSS from local files

Custom Style Script

4.2

Add Custom JavaScript (JS) Code or Styles (CSS) to any page.

TamperJS — Inject Javascript Easily

0.0

Inject, tweak, and customize JavaScript on any website with a powerful Monaco-powered editor.