Comment 2 for bug 1075152

Hm, I'm running it on a fairly stock Ubuntu 12.10 installation, only Variety is installed. So you probably need some of the dependencies of Variety, let's see - can you please try installing gir1.2-gtk-3.0. If this is not enough, you may simply install Variety (sudo add-apt-repository ppa:peterlevi/ppa && sudo apt-get update && sudo apt-get install variety), it will fetch the other dependencies too...

If you manage to run it, a firefox indicator icon should appear, scrolling back and forth over it will print the scroll direction in the terminal.