com.apple.Safari.content-blocker EXExtensionPointIsPublic EXSupportedPlatforms iOS macOS macCatalyst EXRequiredEntitlements com.apple.private.can-load-any-content-blocker NSExtension NSExtensionAttributes NSExtensionPointName com.apple.Safari.content-blocker NSExtensionPointVersion 1.0 NSExtensionHostEntitlement com.apple.private.extension-host.safari-content-blocker NSExtensionProtocol NSObject PrincipalClass NSObject Subsystems NSSharingService_Subsystem com.apple.showsInExtensionsManager XPCService JoinExistingSession RunLoopType NSRunLoop ServiceType Application _AdditionalSubServices apple-extension-service