# Markdown Viewer Webext

> Displays markdown documents beautified in your browser.

Canonical page: [https://chrome-stats.com/d/markdown-viewer-webext](https://chrome-stats.com/d/markdown-viewer-webext)

## Overview

- **ID:** `markdown-viewer-webext`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Cimbali
- **Category:** appearance,other
- **Daily users:** 6,661
- **Weekly downloads:** 76
- **Rating:** 4.17 / 5 (104 ratings)
- **Version:** 1.8.1
- **Last updated:** 2023-02-06
- **First published:** 2017-06-09
- **Size:** 274 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/markdown-viewer-webext/)
- **Website:** [https://github.com/Cimbali/markdown-viewer](https://github.com/Cimbali/markdown-viewer)

## Description

Markdown Viewer Webext is a powerful browser extension designed to render markdown documents seamlessly within your browser. It detects markdown files based on URL extensions like `.md` and `.markdown` and converts plain text markdown syntax into beautifully formatted HTML. Whether you're viewing files online or locally, the extension supports rendering with a simple button click or optionally automatic rendering.

Key features include dark mode support, multiple styling options including a GitHub-like look, customizable CSS, and syntax extensions such as checkboxes, footnotes, LaTeX, mermaid.js diagrams, and emojis. It ensures security by rendering inside a sandboxed iframe and respects website Content-Security-Policy headers. Users can also download rendered markdown as static HTML or link back to the original source. The extension requires minimal permissions and works efficiently without compromising privacy.

## Rankings

- #990 — Overall
- #138 — Other extensions
- #152 — Appearance
- #12 — viewer
- #20 — documentation
- #34 — document

## Permissions and access

### Permissions

- `storage`
- `*://*/*.markdown`
- `*://*/*.md`
- `*://*/*.mdown`
- `*://*/*.mdwn`
- `*://*/*.mkd`
- `*://*/*.mkdn`

### Content script matches

- `*`

## Safety

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

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- 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 praise the add-on for reliably rendering Markdown, good readability, and a lightweight, easy-to-use design with CSS styling options. The main drawbacks are update-related security errors requiring reinstall/rollback, occasional newline rendering inconsistencies, and a save-prompt annoyance when opening files.

### Pros

- Reliable and works as expected across Firefox versions and Linux distributions.
- Excellent for reading Markdown files; viewing a single MD file is very useful.
- Lightweight and no-fuss, with useful CSS styling options.

### Cons

- Security errors in the latest release; reinstalling or rolling back to a previous version is often recommended.
- Inconsistent newline rendering in some Markdown content (CRLF vs LF) leading to unexpected results.
- Prompt to save when opening MD files can be annoying for some users.

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- [Markdown Preview](https://chrome-stats.com/d/markdown-preview-iue) — 3 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/markdown-viewer-webext)