allow user decision when some action fails

scripts/content/content.js

@@ -1,7 +1,12 @@
 (function () {
+    let asleep = false;
     chrome.runtime.onMessage.addListener(
         function (request, sender, sendResponse) {
             if (!request.action) return;
+            if (asleep && ACTION_WAKEUP != request.action) {
+                sendResponse && sendResponse(undefined);
+                return;
+            }
             // console.log("Recieved request:",request);
             doAction(request, sender).then(r => sendResponse && sendResponse(r));
             // return true to indicate you wish to send a response asynchronously
@@ -16,6 +21,8 @@
                 return data;
             case ACTION_GOTO_URL:
                 window.location.replace(request.url);
+                // should not recieve any request until the page & script reload
+                asleep = true;
                 return request.url;
             case ACTION_REPORT_IN:
                 return request.action;
@@ -29,6 +36,12 @@
                     1000,
                     10
                 )
+            case ACTION_SLEEP:
+                asleep = true;
+                return "Content script is sleeping.";
+            case ACTION_WAKEUP:
+                asleep = false;
+                return "Content script is available.";
             default:
                 break;
         }