From b43acfe39681f1a0a143e64231856a09a72f8a60 Mon Sep 17 00:00:00 2001
From: Wojtek Kosior <koszko@koszko.org>
Date: Fri, 4 Mar 2022 17:19:51 +0100
Subject: fix setting of 'blocked-<name>' attributes when blocking intrinsic
 event handlers

---
 content/policy_enforcing.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/content/policy_enforcing.js b/content/policy_enforcing.js
index 0b74de9..f6f4081 100644
--- a/content/policy_enforcing.js
+++ b/content/policy_enforcing.js
@@ -213,7 +213,12 @@ function sanitize_tree_urls(root) {
 
 #IF MOZILLA
 function sanitize_element_onevent(element) {
-    for (const attribute_node of (element.attributes || [])) {
+    if (element.haketilo_sanitized_onevent)
+	return;
+
+    element.haketilo_sanitized_onevent = true;
+
+    for (const attribute_node of [...(element.attributes || [])]) {
 	const attr = attribute_node.localName, attr_lo = attr.toLowerCase();;
 	if (!/^on/.test(attr_lo) || !(attr_lo in element.wrappedJSObject))
 	    continue;
-- 
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