Can I use this for Firefox and Safari development?

Absolutely. The skill includes guidance for cross-browser normalization and feature detection using the webextension-polyfill to ensure compatibility across all major browsers.

How does it handle extension security?

It enforces the principle of least privilege, discourages permission hoarding, and provides specific patterns for validating data boundaries during message passing.

Does this skill support Manifest V3?

Yes, it is optimized specifically for Manifest V3 requirements, including service workers, host permissions, and modern security policies.

Does it help with extension updates?

Yes, it provides strategies for semantic versioning, maintaining backward compatibility, and managing user data preservation across version updates.

Browser Extension Development

Name: Browser Extension Development
Author: phrazzld

byphrazzld

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Browser Automation

Builds secure, cross-browser compatible extensions using Manifest V3 and best practices for permissions and message passing.

This skill streamlines the development of browser extensions for Chrome, Firefox, and Safari by providing standardized patterns for Manifest V3 compliance. It helps developers implement secure background service workers, content scripts, and robust message-passing systems while emphasizing the principle of least privilege. By integrating cross-browser polyfills and semantic versioning strategies, it ensures extensions are modern, maintainable, and ready for multi-store deployment.

Key Features

01Manifest V3 configuration and optimization

02Least-privilege permission management

03Cross-browser compatibility using polyfills

04Semantic versioning and update planning

052 GitHub stars

06Secure cross-script message passing

Use Cases

01Migrating legacy Manifest V2 extensions to Manifest V3

02Implementing secure data communication between content scripts and background workers

03Creating cross-browser extensions for Chrome, Firefox, and Safari simultaneously

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add phrazzld/claude-config browser-extension-dev

For use in Claude.ai and ChatGPT

Download Skill