# Epupp: Live Tamper your Web

> Tamper with web pages, live and/or with userscripts

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

## Overview

- **ID:** `epupp`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** PEZ
- **Category:** web-development
- **Daily users:** 20
- **Weekly downloads:** 1
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 0.0.22
- **Last updated:** 2026-07-19
- **First published:** 2025-12-27
- **Size:** 809 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/epupp/)
- **Website:** [https://github.com/PEZ/epupp/issues](https://github.com/PEZ/epupp/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/epupp/privacy/](https://addons.mozilla.org/firefox/addon/epupp/privacy/)

## Description

<a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c19dc6dfd86a278fdf4ef5e7b0d3f53d41494755b9e8d10c7c9e532c637ca8fb/https%3A//github.com/PEZ/epupp" rel="nofollow">Epupp</a> has two modes of operation:
<ol><li><strong>Live REPL connection from your editor to the web page</strong>, letting you inspect and modify the page on the fly, with or without the assistance of an AI agent.</li><li><strong>Userscripts</strong>: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/84d059b1e711f05b5e08189df02a5b37d792d2c092f23951fa6dedaef9b9e3d1/https%3A//www.tampermonkey.net" rel="nofollow">Tampermonkey</a> style. Target all websites, or any subset of the web's pages, with prepared scripts that modify or query information from the page. Userscripts can be configured to start before the page loads (<code>document-start</code>), when the DOM is ready but resources are still loading (<code>document-end</code>), or after everything has settled (<code>document-idle</code>).</li></ol>
The two form a powerful pair. The live REPL connection, while happily supporting one-off changes or data extractions, is also a very efficient and fun means to interactively develop userscripts.

## Rankings

- #24,541 — Overall
- #115 — live

## Permissions and access

### Permissions

- `scripting`
- `activeTab`
- `storage`
- `webNavigation`
- `alarms`

### Host permissions

- `<all_urls>`

## Safety

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

- [Tampermonkey](https://chrome-stats.com/d/tampermonkey) — 786,881 users, 4.70 / 5
- [Fire Page Editing](https://chrome-stats.com/d/fire-agilitypage) — 28 users, 1.00 / 5
- [Tampermonkey Mini](https://chrome-stats.com/d/tampermonkey-mini) — 6 users
- [Ace Script](https://chrome-stats.com/d/ace-script) — 1,067 users, 3.75 / 5
- [Page Tinker](https://chrome-stats.com/d/page-tinker) — 9 users
- [MyEpiPlus](https://chrome-stats.com/d/myepiplus) — 5 users, 5.00 / 5
- [Greasemonkey](https://chrome-stats.com/d/greasemonkey) — 156,466 users, 4.19 / 5
- [Web Edit](https://chrome-stats.com/d/webedit) — 8 users
- [Web Explode](https://chrome-stats.com/d/web-explode) — 17 users, 5.00 / 5
- [Tinker Tester Developer Spy](https://chrome-stats.com/d/tinker-tester-developer-spy) — 2 users, 4.60 / 5
- [Web Edit](https://chrome-stats.com/d/web-edit) — 1,649 users, 4.83 / 5
- [Enhanced Network Tab](https://chrome-stats.com/d/enhanced-network-tab) — 41 users, 5.00 / 5

---

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