Yes, you need to enable the Spoor plug-in as Rui points out.  Once you do that, there are also some Spoor settings you may want to play around with in the Configuration Settings page.

The downloaded zip will only load in Firefox if you're running it from the local file system.  To get it to work in ALL browsers, it must be hosted on a web server (in most cases, this would be your LMS, but it can also run in a standard web server like Apache).  

Cheers,

Ryan