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The Browser Extension Developer skill empowers Claude to architect, build, and debug browser extensions for Chrome, Firefox, and Edge. It provides standardized implementation patterns for Manifest V3, including service workers, content scripts, and secure message passing. With built-in support for modern build tools like Vite and TypeScript, plus comprehensive security configurations and testing frameworks like Puppeteer and Vitest, this skill accelerates the development of everything from simple productivity tools to complex web-integrated applications while ensuring industry-standard security and performance.