From e8a344d880f1c93cb6f2e5b1ba61cbc7b9836b0b Mon Sep 17 00:00:00 2001
From: Fedor <fedor@mail.ru>
Date: Wed, 12 Aug 2020 10:22:20 +0300
Subject: [PATCH] [Mypal] Clear user prefs for AbortController on migration...

---
 application/palemoon/components/nsBrowserGlue.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/application/palemoon/components/nsBrowserGlue.js b/application/palemoon/components/nsBrowserGlue.js
index 574ca972d..01740f8ca 100644
--- a/application/palemoon/components/nsBrowserGlue.js
+++ b/application/palemoon/components/nsBrowserGlue.js
@@ -1201,7 +1201,7 @@ BrowserGlue.prototype = {
   },
 
   _migrateUI: function() {
-    const UI_VERSION = 23;
+    const UI_VERSION = 24;
     const BROWSER_DOCURL = "chrome://browser/content/browser.xul#";
     let currentUIVersion = 0;
     try {
@@ -1447,6 +1447,13 @@ BrowserGlue.prototype = {
       Services.prefs.clearUserPref("layers.acceleration.disabled");
       Services.prefs.clearUserPref("layers.acceleration.force-enabled");
     }  
+
+    if (currentUIVersion < 24) {
+      // AbortController's worker signalling was fixed so reset user prefs that
+      // might have been set as workaround for web compat issues in the meantime.
+      Services.prefs.clearUserPref("dom.abortController.enabled");
+    }
+
     
     // Clear out dirty storage
     if (this._dirty)