Simple CSS Inserter

By: JM

Bring CSS in and out.

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Features & Capabilities

Simple CSS Inserter is a lightweight and easy-to-use Chrome extension that allows users to quickly insert custom CSS into any webpage. By pressing the toolbar button, you can apply or remove your CSS style instantly, giving you complete control over webpage appearance.

Key features include:

Apply CSS to the top frame only for precise control.
Insert CSS immediately upon page load for seamless styling.
Support for Manifest Version 3 ensuring updated extension standards.
Compatible with Firefox 128+ as well, making it versatile across browsers.
Only one CSS style active at a time to avoid conflicts and maintain clarity.

Whether you're a developer testing styles or a user customizing webpage looks, Simple CSS Inserter offers an effortless and efficient way to manage CSS injection directly from your browser toolbar.

User Growth & Download Statistics

Add-on Developer Tools

By:

Daily users:

Rating:

3.00

(1)

Version:

3.1 Last updated: 2025-03-11

Version code:

5907923

Creation date:

2022-11-05

Risk:

Permissions:

Host permissions:

file:///*
http://*/*
https://*/*

Size:

16.38KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-05

Compare stats and ranking:

Ranking

# 15,645 ▲ 1

Other rankings

#11 in insert keyword 31 #111 in simple keyword 36 ▲ 1

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:

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/simple-css-inserter/

Permission Change History

2024-11-12: Version 2.1 → 3.0

Add Host permissions: file:///* http://*/* https://*/*

Remove Permissions: file:///* http://*/* https://*/*

2024-07-11: Version 2.0 → 2.1

Add Permissions: file:///*

Remove Permissions: file://*/*

2023-12-21: Version 1.10 → 2.0

Add Permissions: menus

2022-11-18: Version 1.3 → 1.4

Remove Permissions: activeTab management

2022-11-12: Version 1.2 → 1.3

Add Permissions: management

User Reviews

Je ne vois pas d'option pour appliquer un css uniquement pour 1 site, puis un autre css pour un autre site, bref un bouton "+" ou "add"

by Fi*****, 2024-11-19

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Is Simple CSS Inserter 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.

Simple CSS Inserter requires a few sensitive permissions. 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.

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.

Simple CSS Inserter 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 **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****