diff --git a/manifest.json b/manifest.json
index 18c4e33..2f6599f 100644
--- a/manifest.json
+++ b/manifest.json
@@ -3,7 +3,7 @@
 
   "name": "Edziennik-plus",
   "description": "Więcej funkcji w dzienniku elektronicznym",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "icons": {"128":"icon.png"},
   "author": "MS",
   "options_ui": {
@@ -45,12 +45,17 @@
   "permissions": [
     "storage",
     "tabs",
+    "webRequest",
+    "webRequestBlocking",
     "https://synergia.librus.pl/*"
   ],
+  "background": {
+    "scripts": ["tlo.js"]
+  },
   "applications": {
     "gecko": {
       "id": "edziennikplus@msx",
-      "update_url": "https://github.com/msxmine/edziennik-plus/blob/updates/updates.json"
+      "update_url": "https://raw.githubusercontent.com/msxmine/edziennik-plus/updates/updates.json"
     }
   }
 }
diff --git a/oceny.js b/oceny.js
index 00e064a..4f5e9fd 100644
--- a/oceny.js
+++ b/oceny.js
@@ -62,6 +62,7 @@ function Ocena(adres)
     }
     else
     {
+      /*
       if (adres.parentElement.parentElement.nodeName == "SPAN")
       {
         var wagasub = 0; //waga wszystkich zbiorowych
@@ -86,8 +87,9 @@ function Ocena(adres)
         this.waga = (wagasub / iloscistotnych) / iloscistotnych
       }
       else{
+        */
       this.waga = tab[tab.indexOf("Waga")+1];
-      }
+      //}
     }
   }
 }
diff --git a/tlo.js b/tlo.js
new file mode 100644
index 0000000..ab37fac
--- /dev/null
+++ b/tlo.js
@@ -0,0 +1,15 @@
+
+function zmienNaglowek(req) {
+    var mojNaglowek = {
+        name: "X-Frame-Options",
+        value: "SAMEORIGIN"
+    };
+    req.responseHeaders.push(mojNaglowek);
+    return {responseHeaders: req.responseHeaders};
+}
+
+browser.webRequest.onHeadersReceived.addListener(
+    zmienNaglowek,
+    {urls: ["https://synergia.librus.pl/przegladaj_plan_lekcji"]},
+    ["blocking", "responseHeaders"]
+);