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When trying to install a chrome extension using manifest_version 3, I am unable to install as I keep getting the error:

The "background.scripts" key cannot be used with manifest_version 3. Use the "background.service_worker" key instead

The "background.persistent" key cannot be used with manifest_version 3. Use the "background.service_worker" key instead.

Manifest V3 no longer supports background pages. Instead it now supports a new feature called service workers.

The key background in your manifest.json can no longer contain the field persistent , and also update the value from scripts to service_worker . Service worker cannot contain an array but can only contain a single string value.

"name": "Test", "description" : "Test Chrome Extension", "version": "1.0", "manifest_version": 3, "background": { "service_worker": "background.js"

Ref: Manifest V3 Migration Checklist

@orschiro Multiple background 'scripts' don't exist in v3. There can only be a single 'service_worker'. developer.chrome.com/docs/extensions/mv3/… KJ Sudarshan Aug 21, 2021 at 10:57

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