Use window.hasOwnProperty for window._qutebrowser

With an element like this in the page:

    <h2 id="_qutebrowser">qutebrowser</h2>

accessing window._qutebrowser will return the HTMLElement (thanks, JS...),
making qutebrowser's JS think it's already initialized when it actually isn't.

Fixes #4633

1 files changed, 1 insertions, 1 deletions

diff --git a/qutebrowser/javascript/global_wrapper.js b/qutebrowser/javascript/global_wrapper.js
index a302bd5d1..0762fd85d 100644
--- a/qutebrowser/javascript/global_wrapper.js
+++ b/qutebrowser/javascript/global_wrapper.js
@@ -1,6 +1,6 @@
 (function() {
     "use strict";
-    if (!("_qutebrowser" in window)) {
+    if (!window.hasOwnProperty("_qutebrowser")) {
         window._qutebrowser = {"initialized": {}};
     }