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