fix workers list handling

lib/main.js

@@ -1,10 +1,18 @@
 /* jshint esnext:true, node:true*/
 "use strict";
-var data = require("sdk/self").data;
+const {
+    Cc, Ci, Cr
+} = require("chrome");
+const {
+    add, remove
+} = require("sdk/util/array");
+const data = require("sdk/self").data;
+const pageMod = require("sdk/page-mod");
+const events = require("sdk/system/events");
+const utils = require("sdk/window/utils");
 var prefs = require("sdk/simple-prefs").prefs;
-var pageMod = require("sdk/page-mod");
-// object of current workers
-var workers = {};
+//  list of current workers
+const workers = [];
 pageMod.PageMod({
     include: "*.www.youtube.com",
     contentStyleFile: data.url("video-js.css"),
@@ -21,7 +29,11 @@ pageMod.PageMod({
             preferredQuality: prefs.preferredQuality,
             volume: prefs.volume
         });
-        workers[worker.tab.id] = worker;
+        add(workers, worker);
+        worker.on("detach", function(e) {
+            remove(workers, this);
+
+        });
     }
 });
 
@@ -36,22 +48,13 @@ require("sdk/simple-prefs").on("", function prefChangeHandler(pref) {
 });
 
 function workersPrefHandler(pref) {
-    for (var worker in workers)
-        if (workers.hasOwnProperty(worker))
-            if (!workers[worker].tab)
-                delete workers[worker];
-            else
-                workers[worker].port.emit("prefChanged", {
-                    name: pref,
-                    value: prefs[pref]
-                });
+    for (let worker of workers)
+        worker.port.emit("prefChanged", {
+            name: pref,
+            value: prefs[pref]
+        });
 }
-const {
-    Cc, Ci, Cr
-} = require("chrome");
 
-var events = require("sdk/system/events");
-var utils = require("sdk/window/utils");
 var YOUTUBE_FLASH_REGEX = /https?:\/\/(www.)?youtube.com\/v\/([^#?\/]*)/;
 var YT_BIN_REGEX = /https:\/\/s.ytimg.com\/yts\/jsbin\/[^\/]*\/base.js/;
 var YT_PLAYER_REGEX = /https?:\/\/s.ytimg.com\/yts\/jsbin\/[^\/]*\/html5player.js/;

package.json

@@ -6,7 +6,7 @@
   "author": "Moez Bouhlel <[email protected]> (http://lejenome.github.io/)",
   "homepage": "https://github.com/lejenome/youtube-html5-player",
   "license": "MPL 2.0",
-  "version": "0.1.3",
+  "version": "0.1.4",
   "preferences": [
     {
       "name": "preferredCodec",