Cross-origin opener policy
cross_origin_opener_policy manifest key lets extensions specify a value for the Cross-Origin-Opener-Policy (COOP) 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.
This key was introduced in Chrome 93.
cross_origin_opener_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-Opener-Policy header when serving resources from the extension's origin. For example:
See Cross-origin isolation overview for more information about this feature.