# HTML Runner

> Run HTML, CSS, and JavaScript instantly in a new tab — no server, no build, no setup.

Canonical page: [https://chrome-stats.com/d/html-runner?hl=es](https://chrome-stats.com/d/html-runner?hl=es)

## Overview

- **ID:** `html-runner`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Mohammad Shaklain
- **Category:** web-development
- **Daily users:** 61
- **Weekly downloads:** 3
- **Rating:** 1.00 / 5 (1 ratings)
- **Version:** 1.0
- **Last updated:** 2026-02-15
- **First published:** 2026-02-12
- **Size:** 19 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/html-runner/)

## Description

HTML Runner is a lightweight Firefox extension that lets you write and preview HTML, CSS, and JavaScript code instantly — all in your browser.

Features:
- Clean editor with HTML / CSS / JS tabs
- Live preview in the same tab (iframe-based)
- Light & dark theme
- Zero dependencies — runs entirely offline
- No data collection, no telemetry

Perfect for learners, teachers, and developers who want a quick sandbox to test code snippets.

## Rankings

- #14,749 — Overall
- #18 — html
- #35 — setup
- #101 — javascript
- #198 — iframe
- #220 — build

## Permissions and access

### Permissions

- `tabs`

## Safety

- **Risk impact:** Moderate 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/html-runner?hl=es)