Chrome Extension Developer

Manifest V3 is Chrome's current extension architecture standard. It requires a manifest.json configuration file, content scripts for DOM interaction, background service workers instead of persistent pages, and popup interfaces. MV3 enforces stronger security policies including Content Security Policy (CSP) and removes remotely hosted code execution.

Security-first patterns include implementing Content Security Policy (CSP) to block inline scripts, validating all user input to prevent XSS attacks, using secure communication between content scripts and background workers, and avoiding eval() or dynamic code execution. Store sensitive data securely and request only necessary permissions in manifest.json.

Chrome Web Store submission requires packaging your extension assets, creating a privacy policy, optimizing your listing with clear descriptions and screenshots, and ensuring compliance with store policies. The extension must be fully tested, include proper documentation, and meet security and functionality standards before deployment.

Yes. MV2 to MV3 migration involves replacing persistent background pages with service workers, updating manifest.json syntax, converting remotely hosted scripts to local files, and adapting deprecated APIs to their MV3 equivalents. Content script and popup logic typically require minimal changes if already following security practices.

Chrome extensions consist of content scripts that interact with web pages, background service workers that handle long-running logic and event listening, popup interfaces for user interaction, and a manifest.json configuration file. These components communicate via message passing and share access to Chrome APIs based on declared permissions.

Use Chrome DevTools to inspect content scripts, background service workers, and popups. Access the Extensions Management page to view error logs. Use console.log() in service workers, set breakpoints in the debugger, and test message passing between components. Check manifest.json for permission and configuration errors that may prevent features from working.