diff --git a/dom/ipc/TabParent.cpp b/dom/ipc/TabParent.cpp
index 191c9ad9be42..f5d5de2859ec 100644
--- a/dom/ipc/TabParent.cpp
+++ b/dom/ipc/TabParent.cpp
@@ -584,20 +584,14 @@ TabParent::ReceiveMessage(const nsString& aMessage,
   nsRefPtr<nsFrameLoader> frameLoader = GetFrameLoader();
   if (frameLoader && frameLoader->GetFrameMessageManager()) {
     nsFrameMessageManager* manager = frameLoader->GetFrameMessageManager();
-
-    // Context may be gone after calling ReceiveMessage, so scope the
-    // context pointer to prevent dangling.
-    JSObject* objectsArray;
-    {
-      JSContext* ctx = manager->GetJSContext();
-      JSAutoRequest ar(ctx);
-      PRUint32 len = 0; //TODO: obtain a real value in bug 572685
-      // Because we want JS messages to have always the same properties,
-      // create array even if len == 0.
-      objectsArray = JS_NewArrayObject(ctx, len, NULL);
-      if (!objectsArray) {
-        return false;
-      }
+    JSContext* ctx = manager->GetJSContext();
+    JSAutoRequest ar(ctx);
+    PRUint32 len = 0; //TODO: obtain a real value in bug 572685
+    // Because we want JS messages to have always the same properties,
+    // create array even if len == 0.
+    JSObject* objectsArray = JS_NewArrayObject(ctx, len, NULL);
+    if (!objectsArray) {
+      return false;
     }
 
     manager->ReceiveMessage(mFrameElement,
diff --git a/dom/tests/browser/Makefile.in b/dom/tests/browser/Makefile.in
index 298261177ae3..b76180f75b10 100644
--- a/dom/tests/browser/Makefile.in
+++ b/dom/tests/browser/Makefile.in
@@ -51,8 +51,6 @@ _BROWSER_FILES = \
 		browser_ConsoleAPITests.js \
 		test-console-api.html \
 		browser_autofocus_preference.js \
-		browser_643083.js \
-	      	test_643083.xul \
 		$(NULL)
 
 libs::	$(_BROWSER_FILES)
diff --git a/dom/tests/browser/browser_643083.js b/dom/tests/browser/browser_643083.js
deleted file mode 100644
index a3bd501f24ef..000000000000
--- a/dom/tests/browser/browser_643083.js
+++ /dev/null
@@ -1,38 +0,0 @@
-// Any copyright is dedicated to the Public Domain.
-// http://creativecommons.org/publicdomain/zero/1.0/
-
-Components.utils.import("resource://gre/modules/Services.jsm");
-
-function test() {
-  waitForExplicitFinish();
-
-  let win = Services.ww.openWindow(
-    window, "chrome://mochitests/content/browser/dom/tests/browser/test_643083.xul", "_blank", "chrome", {});
-  win.addEventListener("load", function() {
-    let browser = win.browser();
-    browser.messageManager.addMessageListener("scroll", function fn(msg) {
-      // Calling win.close() will dispatch the close later if the
-      // JS context of the window is the same as for the win.close()
-      // call. (See nsGlobalWindow::FinalClose())
-      //
-      // Because the crash needs to happen during the same event that
-      // we receive the message, we use an event listener and dispatch
-      // to it synchronously.
-      //
-      window.addEventListener("dummy-event", function() {
-        win.close();
-
-        setTimeout(function() {
-          ok(true, "Completed message to close window");
-          finish();
-        }, 0);
-      }, false);
-
-      let e = document.createEvent("UIEvents");
-      e.initUIEvent("dummy-event", true, false, window, 0);
-      window.dispatchEvent(e);
-
-      finish();
-    });
-  }, false);
-}
diff --git a/dom/tests/browser/test_643083.xul b/dom/tests/browser/test_643083.xul
deleted file mode 100644
index fd4fe06d95e2..000000000000
--- a/dom/tests/browser/test_643083.xul
+++ /dev/null
@@ -1,33 +0,0 @@
-<?xml version="1.0"?>
-
-<!-- Any copyright is dedicated to the Public Domain.
-     http://creativecommons.org/publicdomain/zero/1.0/ -->
-
-<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
-<window title="Bug 643083"
-  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
-  width="500" height="500" orient="vertical"
-  onload="init()">
-
-  <script type="text/javascript"><![CDATA[
-    function init() {
-      var scriptNode = document.getElementById("content-script");
-      var scriptText = scriptNode.textContent;
-      var contentScript = "data:text/javascript;charset=utf-8," + encodeURI(scriptText);
-      messageManager.loadFrameScript(contentScript, true);
-    }
-
-    function browser() {
-      return document.getElementById("content");
-    }
-  ]]></script>
-
-  <!-- The code below runs in the child process and has a different context.
-       It is serialized and loaded as a frame script. Note the type attribute. -->
-  <script id="content-script" type="text/content-javascript"><![CDATA[
-    sendAsyncMessage("scroll", { x: 2, y: 5 });
-  ]]></script>
-
-  <browser type="content" src="" flex="1" id="content"
-           remote="true"/>
-</window>