Barence writes "Mozilla Labs has launched a design competition that aims to find an alternative to tabbed browsing. 'Tabs worked well on slow machines on a thin internet, where ten browser sessions were "many browser sessions,"' Mozilla claims on its Design Challenge website. 'Today, 20+ parallel sessions are quite common; the browser is more of an operating system than a data display application; we use it to manage the web as a shared hard drive. However, if you have more than seven or eight tabs open they become pretty much useless.' Aza Raskin, the head of user experience at Mozilla Labs, has already blogged on the possibility of moving tabs down the side of the browser, with tabs grouped by the type of activity involved (i.e. applications, work spaces)."