Build Chrome Extension

Build, debug, package, and ship Chrome Manifest V3 extensions. Optimize for restart-safe service workers, isolated content scripts, least-privilege permissions, and Web Store review readiness.

When To Use

Trigger when the request matches any of:

• creating a new Chrome MV3 extension or scaffolding from a framework (WXT, Plasmo, CRXJS, Vite)
• editing or generating manifest.json with manifest_version: 3, service_worker, content_scripts, host_permissions, action, or side_panel fields
• implementing or debugging chrome.runtime, chrome.storage, chrome.alarms, chrome.scripting, chrome.tabs, chrome.declarativeNetRequest, chrome.sidePanel, or chrome.offscreen APIs
• fixing MV3 service-worker lifecycle issues: idle termination, top-level listener registration, async onMessage returns, chrome.alarms vs setInterval
• bridging content scripts between ISOLATED and MAIN worlds, or routing fetches through the service worker for cross-origin host permissions
• migrating an MV2 extension to MV3 (background page → service worker, blocking webRequest → declarativeNetRequest, browser_action → action)
• validating a built dist/ or .output/chrome-mv3/ folder, packaging the Web Store zip, writing privacy/permission justifications, or preparing review notes
• choosing or comparing Chrome MV3 frameworks for a new project

Do NOT use this skill when: