# DevTools Prototyper

> This add-on adds JS Fiddle style code prototyping to Firefox DevTools.

Canonical page: [https://chrome-stats.com/d/devtools-prototyper](https://chrome-stats.com/d/devtools-prototyper)

## Overview

- **ID:** `devtools-prototyper`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Tim Nguyen
- **Category:** web-development
- **Daily users:** 12
- **Rating:** 3.50 / 5 (2 ratings)
- **Version:** 5.0a1
- **Last updated:** 2020-12-05
- **First published:** 2014-10-25
- **Size:** 451 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/devtools-prototyper/)

## Description

DevTools Prototyper is a Firefox add-on that enhances DevTools by adding JS Fiddle style code prototyping functionality. It allows users to quickly test and prototype code within the DevTools environment. With keyboard shortcuts, users can easily run their code with a simple key combination. Contributors can contribute to the project on GitHub.

## Rankings

- #30,704 — Overall

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `storage`
- `unlimitedStorage`

## Safety

- **Risk impact:** High 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).

## Similar extensions and apps

- [FicusJS devtools](https://chrome-stats.com/d/ficusjs-devtools)
- [Ext JS 3 DevTools](https://chrome-stats.com/d/ext-js-3-devtools) — 4 users
- [codeTabber](https://chrome-stats.com/d/codetabber) — 1 users
- [Try IT Yourself HTML5 editor](https://chrome-stats.com/d/try-it-html5-editor) — 251 users, 4.14 / 5
- [VisBug](https://chrome-stats.com/d/visbug) — 2,324 users, 5.00 / 5
- [Tinker Tester Developer Spy](https://chrome-stats.com/d/tinker-tester-developer-spy) — 2 users, 4.60 / 5
- [Vertical Tabs](https://chrome-stats.com/d/vertical-tabs) — 822 users, 4.80 / 5
- [Dev Mode](https://chrome-stats.com/d/dev-mode) — 11 users
- [JavaScript Playground ⚡ Online JS Compiler](https://chrome-stats.com/d/javascript-compiler) — 30 users
- [Live Expression-Devloper Tool](https://chrome-stats.com/d/live-expression-devloper-tool) — 16 users, 3.50 / 5
- [Tridactyl](https://chrome-stats.com/d/tridactyl-vim) — 4,962 users, 4.91 / 5
- [Keyboard Shortcuts](https://chrome-stats.com/d/keyboard_shortcuts) — 2 users

---

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