Extractor.watch() improvements

- only watch current window
- stop watch on window close
- don't ask user to confirm when fails

src/background/messaging.ts

@@ -31,7 +31,7 @@ export function sendMessage<T>(
         loop();
 
         async function loop() {
-            logger.debug("Request for", req.action);
+            logger.debug("Request for", Actions[req.action]);
             let tabAvailable = await getTabByID(tab.id);
             if (!tabAvailable) {
                 reject("Task interrupted due to the target tab is closed.");