Key Mistakes Developers Make When Migrating Chrome Extensions to Manifest V3

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Migrating Chrome extensions from Manifest V2 to V3 requires significant rethinking of how extensions operate within the browser, not just a configuration change. One of the most critical shifts is the move from persistent background pages to ephemeral service workers, which shut down after roughly 30 seconds of inactivity. Developers frequently run into issues with asynchronous message handling, overly broad host permissions, and in-memory state being lost on service worker restarts. MV3 also enforces stricter Content Security Policy rules and introduces two distinct content script execution worlds with different access levels. Using tools like chrome.alarms for long-running tasks and chrome.storage for persistent state are among the recommended approaches to avoid common migration failures.

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