Developer shares MV3 extension preflight checklist to catch release failures early

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A developer has published a practical preflight checklist for releasing Manifest V3 browser extensions, aimed at catching issues that only surface after packaging rather than during development. The checklist covers comparing permissions, host access patterns, and content script settings between the last shipped version and the new packaged build. It also recommends mapping each release check to a specific change — such as expanded host access or a modified service worker — rather than relying on a generic test list. The author is building a local command-line tool called MV3 Replay that automates parts of this checklist by reading an unpacked extension and comparing two packaged versions. The tool is in early development, and the author is seeking feedback from Chrome and Edge extension maintainers who already run manual release checks.

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