Firefox 3.6 features built-in support for Personas – lightweight "skins" that change the look of Firefox by changing the header and footer areas, and a new alert system that will warn users when their plug-ins, such as Adobe Flash, are out of date. Scripts can now be run asynchronously to speed up page load times and the browser can detect the orientation of devices, such as MacBooks, using the device's built-in sensor. Other notable changes include support for new CSS, DOM and HTML5 web technologies like the HTML5 File API, improved JavaScript performance – a 20% improvement over Firefox 3.5 – and the ability to display native video in full screen...

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