From b79b897b6e399dcb94d91a2567448c169e16e925 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Thu, 30 Apr 2026 10:33:36 +0800
Subject: [PATCH] import from UXP: [DOM] Do not interrupt worker execution if
 already scheduled. (bf526d70)

---
 dom/workers/ScriptLoader.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/dom/workers/ScriptLoader.cpp b/dom/workers/ScriptLoader.cpp
index 313baf166..c237bfa37 100644
--- a/dom/workers/ScriptLoader.cpp
+++ b/dom/workers/ScriptLoader.cpp
@@ -1474,6 +1474,10 @@ CachePromiseHandler::ResolvedCallback(JSContext* aCx,
                                       JS::Handle<JS::Value> aValue)
 {
   AssertIsOnMainThread();
+  // If execution is already schuled, bail.
+  if (mLoadInfo.mExecutionScheduled) {
+    return;
+  }
   // May already have been canceled by CacheScriptLoader::Fail from
   // CancelMainThread.
   MOZ_ASSERT(mLoadInfo.mCacheStatus == ScriptLoadInfo::WritingToCache ||
@@ -1492,6 +1496,10 @@ CachePromiseHandler::RejectedCallback(JSContext* aCx,
                                       JS::Handle<JS::Value> aValue)
 {
   AssertIsOnMainThread();
+  // If execution is already schuled, bail.
+  if (mLoadInfo.mExecutionScheduled) {
+    return;
+  }
   // May already have been canceled by CacheScriptLoader::Fail from
   // CancelMainThread.
   MOZ_ASSERT(mLoadInfo.mCacheStatus == ScriptLoadInfo::WritingToCache ||