From 8d3c4916b0a0a32a91a0f5bfd596ee58062c6c2b Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Sat, 21 Nov 2020 09:51:14 -0500
Subject: [PATCH] Skip trying to find effective context for `about:srcdoc`
 frames

`about:srcdoc` frames are their own origin, trying to
use the origin of the parent context causes an
exception to be thrown when accessing location.href.
---
 src/js/contentscript.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/js/contentscript.js b/src/js/contentscript.js
index 8b02bf0b1..bd0768c1e 100644
--- a/src/js/contentscript.js
+++ b/src/js/contentscript.js
@@ -116,7 +116,7 @@ vAPI.contentScript = true;
     try {
         while (
             context !== self.top &&
-            context.location.protocol === 'about:'
+            context.location.href.startsWith('about:blank')
         ) {
             context = context.parent;
         }