What are the prerequisites for using this skill?

You need Puppeteer installed in your project and a build script that outputs your extension to a directory (e.g., dist/extension) containing a manifest.json file.

Can I test Manifest V3 features like service workers?

Yes, the skill includes specific patterns for identifying and interacting with Manifest V3 service workers and offscreen documents.

Does this skill work with headless Chrome?

No, Chrome extensions require a graphical interface to load properly. This skill specifically configures Puppeteer to run with headless: false to ensure the extension environment initializes correctly.

How does it interact with sandbox iframes?

Because sandbox iframes are cross-origin, the skill utilizes Puppeteer's frame API to bypass standard DOM limitations and interact directly with the iframe content.

How does the skill handle dynamic extension IDs?

It extracts the extension ID at runtime by monitoring browser targets for the service worker or background page URL, ensuring tests work even when IDs change between unpacked loads.

Chrome Extension E2E Tester

Name: Chrome Extension E2E Tester
Author: paolomoz

bypaolomoz

•

Security & Testing

Automates end-to-end testing for Chrome extensions using Puppeteer to verify features, message routing, and cross-context interactions in real browser environments.

This skill provides a comprehensive framework for running automated end-to-end tests against Chrome extensions by loading them into a real Chrome instance via Puppeteer. It enables developers to automate the full testing lifecycle—from building the extension and launching Chrome with custom flags to programmatically retrieving dynamic extension IDs and navigating specific contexts like side panels, popups, and options pages. By leveraging Puppeteer's frame API, the skill handles complex scenarios such as interacting with CSP-exempt sandbox iframes and verifying critical message routing between service workers, content scripts, and offscreen documents, ensuring high-quality releases through robust regression testing.

Key Features

01Dynamic extension ID retrieval via service worker and background page targets

02Verification patterns for cross-context messaging and extension state initialization

03Automated Chrome launch with unpacked extension loading and isolated user profiles

042 GitHub stars

05Cross-origin sandbox iframe interaction using Puppeteer's frame API

06Direct navigation and interaction with side panels, popups, and options pages

Use Cases

01Testing complex message routing between service workers, side panels, and content scripts

02Automating regression testing for Manifest V3 extensions before store submission

03Verifying Chrome extension UI and feature functionality after code changes

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add paolomoz/skills extension-e2e-test

For use in Claude.ai and ChatGPT