Code Injector

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

Code Injector: Customize Websites with Your Own Code

'Code Injector' is a great development tool for those looking to tailor their browsing experience. With this Firefox add-on, users can effectively inject their own JavaScript, CSS, HTML and files into websites, taking web customization to a new level. But make sure you come equipped with a basic understanding of web programming to maximize the benefits of this powerful tool.
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Add-on stats

Manifest V2
By: Saba
Daily users: 2,161
6
Rating: 4.58
(71)
Version: 0.3.3 (Last updated: 2022-01-16)
Version code: 5350461
Creation date: 2017-10-09
Weekly download count: 42
Firefox on Android: No
Permissions:
  • <all_urls>
  • tabs
  • activeTab
  • storage
  • webNavigation
Size: 2.46M
URLs: Website
Full description: See detailed description

Ranking

# 2,006 ▼ 1
Other rankings
#231 in Web Development ▲ 2 #23 in inject keyword 3 ▼ 1 #117 in code keyword 11 ▲ 3 #216 in coding keyword 2 ▲ 2 #235 in javascript keyword 23 ▼ 7

Other platforms

Code Injector (v0.3.2)
10,000 4.67 (15)
Not available on Android
Code Injector (v0.3.2)
4,180 4.50 (8)

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Works for both CSS and JS injection
  • Simple and efficient to use
  • Effective for modifying web pages
  • Reliable for users who have been using it for a long time
Cons
  • Does not work with restrictive Content Security Policies
  • Cannot inject code into iframes
  • Issues with 'On page load' feature
  • Problems with loading scripts from file or URL
Most mentioned
  • Functionality issues related to Content Security Policy
  • Code injection reliability issues
  • Feature requests for improved usability and options
User reviews
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
by Firefox user 18668748, 2024-11-04
View all user reviews

Add-on 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.
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Risk likelihood

We don't have sufficient data to confidently determine the risk likelihood of Code Injector. Use it at your own risk.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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