As Windows 8 approaches, Mozilla developers have been working hard on a Metro version. If you're using Windows 8 on the desktop, no problem. Tablet users, however, are going to be denied a fully functional Firefox - and will face restrictions on many other third-party applications. In the name of security, Microsoft is forcing them into a "sandbox" on ARM devices. The lockdown renegs on the company's prior promises, and it's going to have some far-reaching effects on many applications.