Manifest - Key
Important: Chrome will be removing support for Chrome Apps on all platforms. Chrome browser and the Chrome Web Store will continue to support extensions. Read the announcement and learn more about migrating your app.
This value can be used to control the unique ID of an extension, app, or theme when it is loaded during development.
To get a suitable key value, first install your extension from a
.crx file (you may need to upload your extension or package it manually). Then, in your user data directory, look in the file
Default/Extensions/_<extensionId>_/_<versionString>_/manifest.json. You will see the key value filled in there.