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This policy is deprecated in M88, Flash is no longer supported by Chrome. Setting the policy lets you set a list of URL patterns that specify the sites that can run the Flash plugin.
Leaving the policy unset means DefaultPluginsSetting applies for all sites, if it's set. If not, the user's personal setting applies.
For detailed information on valid url patterns, please see https://cloud.google.com/docs/chrome-enterprise/policies/url-patterns. However, starting in M85, patterns with '*' and '[*.]' wildcards in the host are no longer supported for this policy.