Manifest - Key
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This value can be used to control the unique ID of an extension, app, or theme when it is loaded during development.
Note: You don't usually need to use this value. Instead, write your code so that the key value doesn't matter by using relative paths and extension.getURL.
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.
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