For general information try Wikipedia article on Firewire (also known by its standard name IEEE 1394), or your favourite search engine.
man man
displays manual page for the man
program itself, and the /firewire
causes the pager (the program that displays the manual page) to search for the word in the manual - which it doesn't contain. When you want manual on something else, call it with appropriate topic, e.g. man sh
to get manual for the shell (system command line interface). You can also try using the apropos
utility to search headings of man pages for a specific term.
apropos
. – Araxia Nov 2 '12 at 17:54