CSS Injector

Name: CSS Injector
Rating: 1.5 (2 reviews)
Author: Francesco De Stefano

By: Francesco De Stefano

Rapidly edit custom style of webpage

Download

Install

Features & Capabilities

It is a browser extension for web designer to easily inject any CSS code into any webpage or website.

Use it to tweak and fix website CSS

It automatically saves your CSS code with local storage APIs

Editor Features

Inspect elements
Toggle custom CSS
Hide overlay panel
Search and replace
Go to line
Undo & redo
Match & close brackets
Folding code
CSS Linter
Continue comments
CSS beautifier
Copy to clipboard
Save style in your file system
Open file from your file system

Limitations

WebExtension only works on sites that allow content scripts.

Send me your suggestions and support the development of this add-on ... Thanks in advance !

License

MIT License.

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

0.5.5 Last updated: 2020-09-16

Version code:

5099299

Creation date:

2020-09-15

Risk:

Permissions:

Content scripts matches:

Size:

458.63KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-14

Compare stats and ranking:

Ranking

# 20,788 ▼ 536

Other rankings

#20 in inject keyword 14 ▼ 3

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:

Francesco De Stefano

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/css-injector/

Website:

https://sourceforge.net/projects/css-injector/

User Reviews

Uses an outdated Linter so EVERYTHING is marked as wrong.

by Fu*****, 2025-11-05

Needs to be enabled every time after reload or redirect.

by Fi*****, 2020-12-01

View all user reviews ›

Is CSS Injector 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.

CSS Injector requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
High ****** ******* *** ********* ********* ******** ***** *** ** ********** ****** * ******** ******* *****

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.

CSS Injector is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

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