Checking in patch from toml@us.ibm.com. This fixes bug 66413, crash when closing windows after using LiveConnect. r=me, sr=jband@netscaoe.com

dom/src/base/nsJSEnvironment.cpp

@@ -371,6 +371,9 @@ nsJSContext::~nsJSContext()
   if (!mContext)
     return;
 
+  // Clear our entry in the JSContext, bugzilla bug 66413
+  ::JS_SetContextPrivate(mContext, nsnull);
+
   // Unregister our "javascript.options.*" pref-changed callback.
   nsresult rv;
   NS_WITH_SERVICE(nsIPref, prefs, kPrefServiceCID, &rv);