Download it, Login, and put some settings to personalize your program.
1. Download
2. Install and Login
3. Goto preferences, tweak, minimize to tray
4. Everything works.
I wanted a small, thin, light application that wrapped the Facebook Messenger service so that I could have Messenger open in an app rather than a browser tab. Caprine does exactly that. It also runs super light (~50Mb of RAM) *and* it has built in privacy features that Facebook does not offer. This is exactly what I was after. Kudos to the App dev for this one.