From 6b2dff668730791b9c7fe78c3f52e85ddf44cb9f Mon Sep 17 00:00:00 2001
From: tophf <tophf@gmx.com>
Date: Sat, 3 Oct 2020 20:17:59 +0300
Subject: [PATCH] treat empty url-prefix() as non-matching

---
 background/style-manager.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/background/style-manager.js b/background/style-manager.js
index ff18192d..4ddb6411 100644
--- a/background/style-manager.js
+++ b/background/style-manager.js
@@ -586,7 +586,7 @@ const styleManager = (() => {
     ) {
       return true;
     }
-    if (section.urlPrefixes && section.urlPrefixes.some(p => query.url.startsWith(p))) {
+    if (section.urlPrefixes && section.urlPrefixes.some(p => p && query.url.startsWith(p))) {
       return true;
     }
     // as per spec the fragment portion is ignored in @-moz-document: