Code Injector

Name: Code Injector
Rating: 4.5833 (72 reviews)
Author: Saba

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

Download

Install Compare

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.

Developer Tools Programming Productivity

By:

Saba

Daily users:

1,895+ 5

Rating:

4.58

(72)

Version:

0.3.3 Last updated: 2022-01-16

Version code:

5350461

Creation date:

2017-10-09

Risk:

Permissions:

<all_urls>
tabs
activeTab
storage
webNavigation

Size:

2.46M

URLs:

Website

Full description:

See detailed description ⏷

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 2,108 ▲ 7

Other rankings

#240 in Web Development ▼ 2 #24 in inject keyword 8 #124 in code keyword 25 ▼ 6 #221 in coding keyword 9 #249 in javascript keyword 44 ▼ 8

Other platforms

Code Injector (v0.3.2)

8,000+ 4.67

(15)

Code Injector (v0.3.2)

4,209+ 4.50

(8)

User reviews

Users appreciate Code Injector for its ability to inject both CSS and JavaScript reliably, praising it as a simple and effective tool for customizing web pages. The extension is seen as one of the best available for this purpose. However, common issues include incompatibility with restrictive Content Security Policies and inability to inject into iframes. Users also desire improvements such as domain-based profile saving, better UI features like persistent popups, and mobile support. Occasional bugs with the 'On page load' feature have also been noted.

Pros

Injects both CSS and JavaScript, unlike many similar add-ons.
Works reliably for injecting code on web pages.
Useful for customizing pages by removing unwanted content or processing data.
Simple and effective tool with no unnecessary features.
Highly regarded as one of the best code injector extensions available.

Cons

Does not work with restrictive Content Security Policies (CSP), limiting its functionality.
Cannot inject code into iframes, restricting its use on certain page elements.
Lacks features such as the ability to save profiles per domain and persistent popup windows.
Some interface limitations, like inability to paste in the code area and lack of Android app version.
Occasional issues with the "On page load" feature when deselected, causing code injection failures.

Recent reviews

by Kaashier, 2025-04-10

The best code injector I know of. So many similar add-ons only inject CSS or JS, but not both.

by DraakjeYoblama, 2025-01-15

by Firefox user 17583962, 2025-01-05

View all user reviews ›

Extension safety

Risk impact

Code Injector requires some sensitive permissions that could impact your browser and data security. 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.
Critical ****** ****** ** ******* ***** ***** *** ** **** ** ***** **** ******** ****** *** ******** ********** * ******* ********
High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****

Risk likelihood

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

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******

Upgrade to see full risk analysis details

Instantly check and monitor your browser extensions' risks and permissions with Extension Guard.