Sand Box:)

To setup qt4  $ sudo apt-get install qt4-dev-tools libqt4-dev libqt4-core libqt4-gui qt4-demos qtcreator qtcreator-dbg qtcreator-doc The demos should locate in /usr/lib/qt4/demos also examples Here is the great reference of setup qt4  http://ashu-geek.blogspot.com/2012/03/qt-47-cross-platform-application-ui.html

Type "about:plugins" in url location box, then expand detail panel of flash player. Disable pepper something. After that everything turn good.