import os.log import SafariServices final class SafariWebExtensionHandler: NSObject, NSExtensionRequestHandling { func beginRequest(with context: NSExtensionContext) { let item = context.inputItems[0] as! NSExtensionItem let message = item.userInfo?[SFExtensionMessageKey] os_log(.default, "Received message from browser.runtime.sendNativeMessage: %@", message as! CVarArg) let response = NSExtensionItem() response.userInfo = [SFExtensionMessageKey: ["Response to": message]] context.completeRequest(returningItems: [response], completionHandler: nil) } }