From 4fc962f774ab2992794afa0244feb26d40842e4c Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Wed, 6 Apr 2022 10:24:09 +0800
Subject: [PATCH] import from UXP: Add missing call to
 WaitForIsDebuggerRegistered (d4b247ab)

---
 dom/workers/WorkerPrivate.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index eb2eb594c..46fe04a22 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -2491,6 +2491,12 @@ WorkerPrivateParent<Derived>::DisableDebugger()
 
   WorkerPrivate* self = ParentAsWorkerPrivate();
 
+  // RegisterDebugger might have been dispatched but not completed.
+  // Wait for its execution to complete before unregistering.
+  if (!NS_IsMainThread()) {
+    self->WaitForIsDebuggerRegistered(true);
+  }
+
   if (NS_FAILED(UnregisterWorkerDebugger(self))) {
     NS_WARNING("Failed to unregister worker debugger!");
   }