What problem does it solve? Building Chrome extensions under Manifest V3 requires navigating a fundamentally changed architecture: persistent background pages are gone, remote code is banned, and blocking webRequest is replaced by declarativeNetRequest. This Skill provides the complete implementation knowledge to build, secure, debug, and publish MV3 extensions without hunting through scattered documentation. ## Core Features & Use Cases - Manifest V3 Architecture Guidance: Covers service worker lifecycle, event-driven patterns, chrome.storage state management, and offscreen documents for DOM access. - Component Communication Patterns: Implements one-time messages, long-lived port connections, cross-extension messaging, and web page to extension communication with origin validation. - Security and Publishing Workflow: Enforces CSP configuration, minimal permission strategies, and walks through Chrome Web Store submission, review, staged rollouts, and self-hosted distribution. - Use Case: When migrating an MV2 extension, use this Skill to convert background pages to service workers, replace blocking webRequest with declarativeNetRequest rules, and update the manifest to pass Web Store review. ## Quick Start Ask the AI to scaffold a Manifest V3 Chrome extension with a service worker, a content script for a specific site, and a popup UI.
