From a6fdb4950303b9f224884453a6642b4b29c6ff4c Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Sat, 9 Dec 2017 21:29:49 +0300
Subject: [PATCH] content script may run before documentElement is present

---
 content/apply.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/content/apply.js b/content/apply.js
index 21fa527b..0f81043b 100644
--- a/content/apply.js
+++ b/content/apply.js
@@ -202,6 +202,17 @@
       requestStyles();
       return;
     }
+
+    if (!document.documentElement) {
+      new MutationObserver((mutations, observer) => {
+        if (document.documentElement) {
+          observer.disconnect();
+          applyStyles(styles);
+        }
+      }).observe(document, {childList: true});
+      return;
+    }
+
     if ('disableAll' in styles) {
       doDisableAll(styles.disableAll);
       delete styles.disableAll;