Firefox is the browser developed by the non-profit Mozilla Foundation. That way you can save the broken bits for rubble later on. What happened with the app is that you got special-purpose containers, if you will, for every kind of content. For the upper floor, glue the tiles shown down to a piece of cereal box.
It filled an entire classroom. Also glue 5 complete columns and 1 broken column using long and short column pieces. They wanted it to be versatile. In fact, they had a very interesting experiment in which Facebook was trying to figure out how hiccups in the program were affecting the users. You'll notice that the 4" diameter pieces have a steeper angle to them.