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.
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:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2021-08-03 UTC."],[],[]]