.torrent is a file used to refrence in the bittorrent p2p networks the file contains info on where the other people that have the file are like this:
Music.torrent points to a song and based on how many people have that song (it is known through hashs and file checksums) you may download it
As for mozilla it is a better sroswer the IE or infact anything out there it can do everything and doesnt get any spyware (because it isnt compadable with it) very fast for both high and low speed users if you get the full package (not firefox) it comes with stuff like an irc bot and a mail client since it is opensource it is more secure and has endless possabltys
