Add quirk for missing globalThis

globalThis was introduced in Chrome 71:
https://caniuse.com/#feat=mdn-javascript_builtins_globalthis

Since those websites are quite common and we probably want to continue
supporting Qt 5.12 for a bit, let's bite the bullet and add a small polyfill,
because it's trivial.

Fixes #5486

1 files changed, 9 insertions, 0 deletions

diff --git a/qutebrowser/javascript/globalthis_quirk.user.js b/qutebrowser/javascript/globalthis_quirk.user.js
new file mode 100644
index 000000000..03e74de3c
--- /dev/null
+++ b/qutebrowser/javascript/globalthis_quirk.user.js
@@ -0,0 +1,9 @@
+// ==UserScript==
+// @include https://www.reddit.com/*
+// @include https://open.spotify.com/*
+// ==/UserScript==
+
+// Polyfill for a failing globalThis with older Qt versions.
+
+"use strict";
+window.globalThis = window;