CSSViewer

Name: CSSViewer
Rating: 4.5 (22 reviews)
Author: Mohsen Khanpour

By: Mohsen Khanpour

A simple yet powerful CSS property viewer. For Firefox Quantum

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Features & Capabilities

CSSViewer is a lightweight and efficient extension designed for Firefox Quantum users who want to quickly inspect CSS properties of any web element. It simplifies the process of viewing styles without the need to open developer tools fully, making web development and debugging faster and more convenient.

With CSSViewer, you can effortlessly see all CSS properties applied to elements on a page, improving productivity and aiding in learning CSS. Its easy-to-use interface ensures both beginners and experts benefit from instant style information. Try CSSViewer to enhance your CSS inspection experience in Firefox Quantum today!

User Growth & Download Statistics

Add-on Developer Tools Programming

By:

Daily users:

Rating:

Version:

1.2resigned1 Last updated: 2024-04-25

Version code:

5731153

Creation date:

2018-06-05

Risk:

Permissions:

tabs
http://*/*
https://*/*
file://*/*
contextMenus

Size:

306.36KB

Email:

mo*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-14

Compare stats and ranking:

Ranking

# 1,465 ▲ 9

Other rankings

#164 in Web Development #234 in Other extensions ▼ 1#16 in property keyword 19 ▼ 2#25 in viewer keyword 62 #239 in power keyword 36 ▼ 3

Other platforms

CSSViewer (v1.7)

90,000 4.40

(368)

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:

Mohsen Khanpour

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/cssviewer-quantum/

Email:

mo*****@gmail.com

Website:

https://github.com/mohsenkhanpour/CSSViewer

User Reviews

Users repeatedly praise CSSViewer as a simple, lightweight and very useful tool for quickly viewing element CSS (names, classes/IDs and rules), especially for novices. Reviews show it generally works for many, but there are mixed reports about compatibility on newer Firefox versions, requests for live editing/refresh features, and a few UI quirks (truncated long names, right-click launch).

Pros

Very useful for quickly viewing CSS rules (multiple users call it 'very useful' or 'fantastic').
Clearly displays element names, classes/IDs and CSS details — helpful for novices and fast checks.
Lightweight, simple and functional — several reviews praise its clean look and ease of use.
Works reliably for many users (several say 'All working' or thank the developer for restoring it).

Cons

Mixed reports on reliability/compatibility — at least one user reports it does not work on newer Firefox (FF100+).
Some see it as redundant with Firefox's built-in Inspect Element tool.
Missing advanced features: no in-add-on CSS editing/refresh workflow (requested by multiple users).
UI quirks reported (e.g., long class/ID names may be truncated, and some users dislike having to right‑click to open it).

Recent reviews

by Se*****, 2025-11-05

by Se*****, 2024-09-08

by Am*****, 2024-07-19

View all user reviews ›

Is CSSViewer 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.

CSSViewer 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.
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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.

CSSViewer 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.
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