# CSSViewer

> A simple yet powerful CSS property viewer. For Firefox Quantum

Canonical page: [https://chrome-stats.com/d/cssviewer-quantum](https://chrome-stats.com/d/cssviewer-quantum)

## Overview

- **ID:** `cssviewer-quantum`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mohsen Khanpour
- **Category:** web-development,other
- **Daily users:** 3,243
- **Weekly downloads:** 35
- **Rating:** 4.48 / 5 (21 ratings)
- **Version:** 1.2resigned1
- **Last updated:** 2024-04-25
- **First published:** 2018-06-05
- **Size:** 306 KB
- **Data as of:** 2026-09-04
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/cssviewer-quantum/)
- **Website:** [https://github.com/mohsenkhanpour/CSSViewer](https://github.com/mohsenkhanpour/CSSViewer)

## Description

**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!

## Rankings

- #1,564 — Overall
- #169 — Web Development
- #238 — Other extensions
- #16 — property
- #28 — viewer

## Permissions and access

### Permissions

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

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

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).

## Similar extensions and apps

- [CSS Property Viewer](https://chrome-stats.com/d/css-property-viewer-1)
- [CSS Property Viewer](https://chrome-stats.com/d/css-property-viewer)
- [CSS Viewer](https://chrome-stats.com/d/css-viewer-1) — 1 users
- [CSS Viewer Vn](https://chrome-stats.com/d/css-viewer-vn)
- [Simple CSS Viewer](https://chrome-stats.com/d/browser-css-viewer)
- [CSS Viewer CJ](https://chrome-stats.com/d/css-viewer-cj) — 2 users
- [CSS Viewer](https://chrome-stats.com/d/inspectcssviewer) — 2 users
- [CSS Viewer](https://chrome-stats.com/d/css-viewer-style) — 2.00 / 5
- [CSS Viewer](https://chrome-stats.com/d/css_viewer) — 18 users, 5.00 / 5
- [CSS Peeper](https://chrome-stats.com/d/css-peeper) — 536 users, 1.00 / 5
- [à la mode](https://chrome-stats.com/d/a-la-mode)
- [Cewsag - CSS Viewer](https://chrome-stats.com/d/cewsag) — 23 users, 5.00 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/cssviewer-quantum)