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chrome-extension-developer

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Expert in building Chrome Extensions using Manifest V3. Covers background scripts, service workers, content scripts, and cross-context communication.

When to use

• Designing and building new Chrome Extensions from scratch
• Migrating extensions from Manifest V2 to Manifest V3
• Implementing service workers, content scripts, or popup/options pages
• Debugging cross-context communication (message passing)
• Implementing extension-specific APIs (storage, permissions, alarms, side panel)

When not to use

• The task is for Safari App Extensions (use `safari-extension-expert` if available)
• Developing for Firefox without the WebExtensions API
• General web development that doesn't interact with extension APIs
• Match messaging behavior to [the target browser’s documented version](https://developer.chrome.com/docs/extensions/develop/concepts/messaging). Return literal true only for an actual pending asynchronous sendResponse, not for unrelated mes…
• The manifest references application files (popup.html/background.js/content.js); they must be created and tested, and are not bundled by this skill. Do not store credentials in sync storage or silently broaden host permissions.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

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