Blog Posts tagged #manifest-v3

10 Manifest V3 notes: service worker races, dropped registrations, and other quiet failures Six Manifest V3 behaviors that produce no error where anyone is looking: a startup reconcile racing itself into Duplicate script ID, content script registrations dropped on reload, an offscreen document that resolves before it can receive messages, an invalidated context, a test harness that loads nothing, and a runtime that blocks its host thread. Aug 19, 2026 · 4 min Duplicate script ID