# Skim — Markdown Viewer & Reader

> Read markdown beautifully. Open .md files from your computer or the web, with themes, math, diagrams, and AI-agent support.

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

## Overview

- **ID:** `skim-markdown-viewer-reader`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Skim
- **Category:** web-development
- **Daily users:** 12
- **Weekly downloads:** 11
- **Version:** 2.1.0
- **Last updated:** 2026-07-06
- **First published:** 2026-07-03
- **Size:** 2.28 MB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/skim-markdown-viewer-reader/)
- **Website:** [https://skim.md](https://skim.md/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/skim-markdown-viewer-reader/privacy/](https://addons.mozilla.org/firefox/addon/skim-markdown-viewer-reader/privacy/)

## Description

Skim is a markdown viewer and reader for Firefox that renders .md files as clean, themed documents. Open a .md file from your computer or the web and Skim replaces the raw text with a formatted page: tables, task lists, images, and every README.

Built for how people read markdown today: AI coding agents write it constantly. Skim watches the file and auto-reloads the instant it's rewritten, turns YAML frontmatter into a readable header card, and adds a one-click "Copy for AI" button that hands the whole document back as clean markdown.

Full-featured: KaTeX math, mermaid diagrams, syntax-highlighted code with copy buttons, a scrollspy table of contents, light and dark themes, print/PDF export, encoding detection, and per-block RTL/LTR direction.

Skim collects no data: no telemetry, no analytics, nothing sent anywhere. Fully open source (MIT). Every feature is free. Issues: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/5f148b6de275f858187597cf88675cb165916c6f3ad9bf4d8ad86d71e5a2b88a/https%3A//github.com/skim-md/skim" rel="nofollow">https://github.com/skim-md/skim</a>

## Rankings

- #30,889 — Overall
- #180 — reader
- #185 — viewer

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `scripting`
- `tabs`

### Host permissions

- `file:///*`

### Content script matches

- ``
- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High 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).

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