Build MV3 browser extensions with TypeScript for Chrome and Firefox.
npx skills add https://github.com/KJ-devs/focus-shield --skill extension-dev-kj-devs
Please help me install this Agent Skill. Skill: extension-dev Source: https://github.com/KJ-devs/focus-shield/tree/main/.claude/skills/extension-dev Command: npx skills add https://github.com/KJ-devs/focus-shield --skill extension-dev-kj-devs
Developers struggle to deliver consistent, MV3-compliant browser extensions across Chrome and Firefox, with complex wiring between service workers, declarativeNetRequest rules, content scripts, and native messaging.
Create a new MV3 extension scaffold for Focus Shield and wire up background, content scripts, popup, and blocked-page UI.
High-intent search queries and answers about installing and using this skill.
To build a cross-browser MV3 extension, you need a multi-entry build pattern that enforces Manifest V3 compliance while applying polyfills and strict TypeScript typing for Chrome and Firefox API differences. This ensures consistent service worker and content script behavior across both browsers.
Dynamic declarativeNetRequest rule management in an MV3 extension involves configuring rule sets within the background service worker to modify network requests. This approach replaces blocking web request listeners to maintain cross-browser compatibility and adhere to MV3 performance constraints.
Yes, you can use TypeScript with strict typing for MV3 browser extension APIs by applying type definitions and polyfills. This approach type-checks Chrome and Firefox API calls, reducing runtime errors when wiring background service workers, content scripts, and popup UI components.
The best way to set up native messaging with a fallback is to wire the MV3 background service worker to communicate with a desktop app via native messaging, using a WebSocket connection as a fallback. This ensures reliable desktop integration even if native messaging fails.
Structuring a multi-entry build for an MV3 extension requires configuring your bundler to output separate scripts for the background service worker, content scripts, popup UI, and blocking page. This pattern ensures each extension entry point loads independently and efficiently.
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