Extractor.stop()

src/background/extractor.ts

@@ -51,14 +51,19 @@ export class Extractor {
     /**
      * Start the task chain.
      */
-    async start() {
+    start() {
         return this._startTasks(0);
     }
+    stop() {
+        for (let i = 0; i < this._tasks.length; i++) {
+            this._tasks[i].stop();
+        }
+    }
     /**
      * restart from specified task, but don't restart the previous tasks.
      * @param {number} from where to restart the tasks, begins with 0
      */
-    async restart(from: number = 0) {
+    restart(from: number = 0) {
         let id = this._checkTaskId(from, 0);
         if (id < 0) return;
         for (let i = id; i < this._tasks.length; i++) {