Remote Preview allows to preview any URL on large number of mobile devices simultaneously
Remote Preview is a free open source tool built for open device labs, which allows to preview almost any URL on large number of mobile devices simultaneously.
Just enable the extension, go to a URL, and the URL gets automatically loaded on each device. Supports tab changing too. Works on platforms like Android, Blackberry, iOS, Maemo, Meego, Symbian, Windows Phone and WebOS.
Please note that the Remote Preview extension requires that you have a working Remote Preview script running on a server or a localhost. You can find more information about it here: http://viljamis.com/blog/2012/remote-preview/