From 108907d4f1dbde8ac487f96c0608144b70769acc Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Wed, 12 Feb 2020 19:44:25 +0300
Subject: [PATCH] skip transition-patch in invisible tabs (#851)

---
 content/style-injector.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/content/style-injector.js b/content/style-injector.js
index 1b496b4c..96755c73 100644
--- a/content/style-injector.js
+++ b/content/style-injector.js
@@ -107,10 +107,12 @@ self.createStyleInjector = self.INJECTED === 1 ? self.createStyleInjector : ({
   }
 
   function _applyTransitionPatch(styles) {
+    isTransitionPatched = true;
     // CSS transition bug workaround: since we insert styles asynchronously,
     // the browsers, especially Firefox, may apply all transitions on page load
-    isTransitionPatched = document.readyState === 'complete';
-    if (isTransitionPatched || !styles.some(s => s.code.includes('transition'))) {
+    if (document.readyState === 'complete' ||
+        document.visibilityState === 'hidden' ||
+        !styles.some(s => s.code.includes('transition'))) {
       return;
     }
     const el = _createStyle(PATCH_ID, `