# Code Injector

> Inject code into websites! (JavaScript, CSS, HTML and Files)

Canonical page: [https://chrome-stats.com/d/codeinjector](https://chrome-stats.com/d/codeinjector)

## Overview

- **ID:** `codeinjector`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Saba
- **Category:** web-development,other
- **Daily users:** 1,514
- **Weekly downloads:** 14
- **Rating:** 4.58 / 5 (74 ratings)
- **Version:** 0.3.3
- **Last updated:** 2022-01-16
- **First published:** 2017-10-09
- **Size:** 2.35 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/codeinjector/)
- **Website:** [https://github.com/Lor-Saba/Code-Injector](https://github.com/Lor-Saba/Code-Injector)

## Description

The Code Injector Chrome extension empowers users to inject custom JavaScript, CSS, HTML, and files directly into any website. Ideal for developers and web designers, it requires a basic understanding of web programming to operate effectively. This add-on enables you to customize website appearance and behavior on the fly, enhancing testing, debugging, and personalization workflows.

For detailed usage, documentation is available on GitHub, providing necessary guidance for smooth operation. Whether tweaking styles or adding scripts, Code Injector is a versatile tool for anyone looking to interact with web pages beyond standard browsing capabilities.

## Rankings

- #2,599 — Overall
- #294 — Web Development
- #32 — inject
- #167 — code
- #217 — codes
- #239 — coding

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `activeTab`
- `storage`
- `webNavigation`

## Safety

- **Risk impact:** High 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 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).

## Review summary

Users broadly praise Code Injector as a fast, reliable tool that can inject both CSS and JavaScript, earning it top marks as one of the best extensions for code injection. However, its effectiveness is limited by site security: restrictive Content Security Policies block functionality on many sites, and iframe injection is not supported. A few users also request domain-based profiles and more stable popup behavior, but the overall sentiment remains highly positive for everyday use.

### Pros

- Highly effective code injector that supports both CSS and JavaScript injections.
- No-nonsense, easy-to-use tool that consistently works.
- Widely regarded as one of the best injection extensions available.

### Cons

- Content Security Policy restrictions prevent operation on sites with strict CSP.
- Cannot inject code into iframes.

## Similar extensions and apps

- [Code Injector](https://chrome-stats.com/d/codee-injector)
- [Code Injector](https://chrome-stats.com/d/codeee-injector) — 1 users
- [Code Injector](https://chrome-stats.com/d/code1a-injector)
- [Code Injector](https://chrome-stats.com/d/code-injectorr1)
- [Code Injector](https://chrome-stats.com/d/code4-injector)
- [Code Injector](https://chrome-stats.com/d/code-injectorrr) — 1 users
- [Code Injector13](https://chrome-stats.com/d/code-injector13)
- [Code Injectorin](https://chrome-stats.com/d/code-injectorin)
- [Code Injector989](https://chrome-stats.com/d/code-injector989) — 1 users
- [Code Injectorik](https://chrome-stats.com/d/code-injectorik)
- [Code Injectorloaz](https://chrome-stats.com/d/code-injectorloaz)
- [Code Injectorcx](https://chrome-stats.com/d/code-injectorcx)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/codeinjector)