Cross-origin opener policy
The Chrome Web Store no longer accepts Manifest V2 extensions. Please use Manifest V3 when building new extensions. You will find a section on upgrading in the navigation tree at the left, including the Manifest V2 support timeline.
The 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.
Together with cross_origin_embedder_policy, this key allows extensions opt into cross-origin isolation.
Manifest declaration
This key was introduced in Chrome 93.
The 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:
{
...
"cross_origin_opener_policy": {
"value": "same-origin"
},
...
}
See Cross-origin isolation overview for more information about this feature.