diff --git a/src/Config.py b/src/Config.py
index 89571f20..23b8d29a 100644
--- a/src/Config.py
+++ b/src/Config.py
@@ -8,7 +8,7 @@ class Config(object):
 
     def __init__(self, argv):
         self.version = "0.3.6"
-        self.rev = 881
+        self.rev = 884
         self.argv = argv
         self.action = None
         self.config_file = "zeronet.conf"
diff --git a/src/Ui/media/Wrapper.coffee b/src/Ui/media/Wrapper.coffee
index 708756d4..c0d91756 100644
--- a/src/Ui/media/Wrapper.coffee
+++ b/src/Ui/media/Wrapper.coffee
@@ -1,6 +1,11 @@
 class Wrapper
 	constructor: (ws_url) ->
 		@log "Created!"
+		if window.opener
+			@log "Security error: Opener present, exiting..."
+			document.write("Forbidden: Opener present.")
+			document.body.innerHTML = "Forbidden: Opener present."
+			return
 
 		@loading = new Loading()
 		@notifications = new Notifications($(".notifications"))
diff --git a/src/Ui/media/all.js b/src/Ui/media/all.js
index ed8b4cca..436e2e9e 100644
--- a/src/Ui/media/all.js
+++ b/src/Ui/media/all.js
@@ -762,6 +762,12 @@ jQuery.extend( jQuery.easing,
       this.onMessageInner = __bind(this.onMessageInner, this);
       this.onMessageWebsocket = __bind(this.onMessageWebsocket, this);
       this.log("Created!");
+      if (window.opener) {
+        this.log("Security error: Opener present, exiting...");
+        document.write("Forbidden: Opener present.");
+        document.body.innerHTML = "Forbidden: Opener present.";
+        return;
+      }
       this.loading = new Loading();
       this.notifications = new Notifications($(".notifications"));
       this.fixbutton = new Fixbutton();