Building a Cookie Manager Chrome Extension: What I Learned From the MV3 Transition

Short summary

A technical deep-dive on building a Manifest V3 cookie manager extension, solving MV3's service worker inactivity via port connections, implementing cookie API patterns with domain/session handling, managing httpOnly restrictions, and adding filtering and export/import features.

• •MV3 service workers terminate on inactivity; keep them alive using port connections for real-time cookie monitoring
• •Chrome cookies API requires careful domain string handling and session vs persistent cookie preservation logic
• •Extensions can read and modify httpOnly cookies despite JavaScript restrictions, enabling functionality unavailable in DevTools

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