He&#x27;s right. Mozilla, a $200-300 million a year outfit, currently maintains their software including Firefox. It&#x27;s a huge C++ application. People who code XUL in their spare time, even a bunch of them, aren&#x27;t likely to make a dent in keeping parity between a Firefox fork and the main release. They&#x27;d likely have trouble even porting it.<p>So, a fork is a rough solution and will have maintenance issues for an app this size.