I am not using Trisquel on the computer I'm using at the moment (I have
UEFI), so I'm not sure what is preinstalled in Trisquel.
Here is the list of all dependencies:
http://pastebin.com/DKMzjWZV
I'm not sure why it wouldn't need a firewall...
I am starting to use Trisquel because I am tired of free software and my
privacy being abused. I switched from Ubuntu to more free alternatives after
Ubuntu started taking advantage of their userbase, and started taking the
contributions of the community, then profiting off of them.