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The cross_origin_embedder_policy manifest key lets the extension to specify a value for the
Cross-Origin-Embedder-Policy (COEP) response header for requests to the extension's
origin. This includes the extension's background context (service worker or background page),
popup, options page, tabs that are open to an extension resource, etc.
The cross_origin_embedder_policy manifest key takes an object. This object should only contain one
property named value with a string value. Chrome uses this string as the value of the
Cross-Origin-Embedder-Policy header when serving resources from the extension's origin. For
example: