Cross-origin isolation

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Cross-origin isolation enables a web page to use powerful features such as SharedArrayBuffer. An extension can opt into cross-origin isolation by specifying the appropriate values for the cross_origin_embedder_policy and cross_origin_opener_policy manifest keys. For example, a manifest like the one below will opt the extension's origin into cross-origin isolation.

{"name":"CrossOriginIsolation example","manifest_version":3,"version":"1.1","cross_origin_embedder_policy":{"value":"require-corp"},"cross_origin_opener_policy":{"value":"same-origin"},...}

Opting into cross-origin isolation allows the extension to use powerful APIs like SharedArrayBuffers in its cross-origin isolated contexts. However, it does also come with certain side-effects. See Making your website "cross-origin isolated" using COOP and COEP for more information on this.