diff --git a/dom/broadcastchannel/BroadcastChannel.cpp b/dom/broadcastchannel/BroadcastChannel.cpp
index 1819620330f1..6cfbfb71c9a4 100644
--- a/dom/broadcastchannel/BroadcastChannel.cpp
+++ b/dom/broadcastchannel/BroadcastChannel.cpp
@@ -67,15 +67,13 @@ nsIPrincipal* GetPrincipalFromThreadSafeWorkerRef(
 class InitializeRunnable final : public WorkerMainThreadRunnable {
  public:
   InitializeRunnable(ThreadSafeWorkerRef* aWorkerRef, nsACString& aOrigin,
-                     PrincipalInfo& aPrincipalInfo, bool* aThirdPartyWindow,
-                     ErrorResult& aRv)
+                     PrincipalInfo& aPrincipalInfo, ErrorResult& aRv)
       : WorkerMainThreadRunnable(
             aWorkerRef->Private(),
             NS_LITERAL_CSTRING("BroadcastChannel :: Initialize")),
         mWorkerRef(aWorkerRef),
         mOrigin(aOrigin),
         mPrincipalInfo(aPrincipalInfo),
-        mThirdPartyWindow(aThirdPartyWindow),
         mRv(aRv) {
     MOZ_ASSERT(mWorkerRef);
   }
@@ -111,9 +109,6 @@ class InitializeRunnable final : public WorkerMainThreadRunnable {
       return true;
     }
 
-    *mThirdPartyWindow =
-        nsContentUtils::IsThirdPartyWindowOrChannel(window, nullptr, nullptr);
-
     return true;
   }
 
@@ -121,7 +116,6 @@ class InitializeRunnable final : public WorkerMainThreadRunnable {
   RefPtr<ThreadSafeWorkerRef> mWorkerRef;
   nsACString& mOrigin;
   PrincipalInfo& mPrincipalInfo;
-  bool* mThirdPartyWindow;
   ErrorResult& mRv;
 };
 
@@ -248,6 +242,14 @@ already_AddRefed<BroadcastChannel> BroadcastChannel::Constructor(
       return nullptr;
     }
 
+    // We want to allow opaque origins.
+    if (!principal->GetIsNullPrincipal() &&
+        nsContentUtils::StorageAllowedForWindow(window) <=
+            nsContentUtils::StorageAccess::eDeny) {
+      aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+      return nullptr;
+    }
+
     aRv = principal->GetOrigin(origin);
     if (NS_WARN_IF(aRv.Failed())) {
       return nullptr;
@@ -257,13 +259,6 @@ already_AddRefed<BroadcastChannel> BroadcastChannel::Constructor(
     if (NS_WARN_IF(aRv.Failed())) {
       return nullptr;
     }
-
-    if (nsContentUtils::IsThirdPartyWindowOrChannel(window, nullptr, nullptr) &&
-        nsContentUtils::StorageAllowedForWindow(window) !=
-            nsContentUtils::StorageAccess::eAllow) {
-      aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
-      return nullptr;
-    }
   } else {
     JSContext* cx = aGlobal.Context();
 
@@ -281,16 +276,15 @@ already_AddRefed<BroadcastChannel> BroadcastChannel::Constructor(
 
     RefPtr<ThreadSafeWorkerRef> tsr = new ThreadSafeWorkerRef(workerRef);
 
-    bool thirdPartyWindow = false;
-
-    RefPtr<InitializeRunnable> runnable = new InitializeRunnable(
-        tsr, origin, principalInfo, &thirdPartyWindow, aRv);
+    RefPtr<InitializeRunnable> runnable =
+        new InitializeRunnable(tsr, origin, principalInfo, aRv);
     runnable->Dispatch(Canceling, aRv);
     if (aRv.Failed()) {
       return nullptr;
     }
 
-    if (thirdPartyWindow && !workerPrivate->IsStorageAllowed()) {
+    if (principalInfo.type() != PrincipalInfo::TNullPrincipalInfo &&
+        !workerPrivate->IsStorageAllowed()) {
       aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
       return nullptr;
     }
diff --git a/netwerk/cookie/test/browser/browser.ini b/netwerk/cookie/test/browser/browser.ini
index 50fb89989f13..7ceb298a80d5 100644
--- a/netwerk/cookie/test/browser/browser.ini
+++ b/netwerk/cookie/test/browser/browser.ini
@@ -3,5 +3,6 @@ support-files =
   file_empty.html
   head.js
 
+[browser_broadcastChannel.js]
 [browser_originattributes.js]
 [browser_storage.js]
diff --git a/netwerk/cookie/test/browser/browser_broadcastChannel.js b/netwerk/cookie/test/browser/browser_broadcastChannel.js
new file mode 100644
index 000000000000..2355131b9e7b
--- /dev/null
+++ b/netwerk/cookie/test/browser/browser_broadcastChannel.js
@@ -0,0 +1,77 @@
+// BroadcastChannel is not considered part of CookieJar. It's not allowed to
+// communicate with other windows with different cookie settings.
+
+CookiePolicyHelper.runTest("BroadcastChannel", {
+  cookieJarAccessAllowed: async _ => {
+    new content.BroadcastChannel("hello");
+    ok(true, "BroadcastChannel be used");
+  },
+
+  cookieJarAccessDenied: async _ => {
+    try {
+      new content.BroadcastChannel("hello");
+      ok(false, "BroadcastChannel cannot be used!");
+    } catch (e) {
+      ok(true, "BroadcastChannel cannot be used!");
+      is(e.name, "SecurityError", "We want a security error message.");
+    }
+  }
+});
+
+CookiePolicyHelper.runTest("BroadcastChannel in workers", {
+  cookieJarAccessAllowed: async _ => {
+    function nonBlockingCode() {
+      new BroadcastChannel("hello");
+      postMessage(true);
+    }
+
+    let blob = new content.Blob([nonBlockingCode.toString() + "; nonBlockingCode();"]);
+    ok(blob, "Blob has been created");
+
+    let blobURL = content.URL.createObjectURL(blob);
+    ok(blobURL, "Blob URL has been created");
+
+    let worker = new content.Worker(blobURL);
+    ok(worker, "Worker has been created");
+
+    await new content.Promise((resolve, reject) => {
+      worker.onmessage = function(e) {
+        if (e) {
+          resolve();
+        } else {
+          reject();
+        }
+      };
+    });
+  },
+
+  cookieJarAccessDenied: async _ => {
+    function blockingCode() {
+      try {
+        new BroadcastChannel("hello");
+        postMessage(false);
+      } catch (e) {
+        postMessage(e.name == "SecurityError");
+      }
+    }
+
+    let blob = new content.Blob([blockingCode.toString() + "; blockingCode();"]);
+    ok(blob, "Blob has been created");
+
+    let blobURL = content.URL.createObjectURL(blob);
+    ok(blobURL, "Blob URL has been created");
+
+    let worker = new content.Worker(blobURL);
+    ok(worker, "Worker has been created");
+
+    await new content.Promise((resolve, reject) => {
+      worker.onmessage = function(e) {
+        if (e) {
+          resolve();
+        } else {
+          reject();
+        }
+      };
+    });
+  }
+});