Firefox no me abre mis .php

[Jairo Lopez Pérez]

Bueno, el tema es que tampoco puedo iniciar el servidor mysql:
la consola me dice que revise el syslog:
Nov 11 02:15:18 localhost mysqld_safe[23373]: started
Nov 11 02:15:18 localhost mysqld[23376]: Fatal error: Can't change to
run as user 'localhost'.  Please check that the user exists!
Nov 11 02:15:18 localhost mysqld[23376]: 051111  2:15:18 Aborting
Nov 11 02:15:18 localhost mysqld[23376]: 
Nov 11 02:15:18 localhost mysqld[23376]: 051111
2:15:18 /usr/sbin/mysqld: Apagado completado
Nov 11 02:15:18 localhost mysqld[23376]: 
Nov 11 02:15:18 localhost mysqld_safe[23378]: ended
Nov 11 02:15:24 localhost /etc/init.d/mysql[23427]: 10 processes alive
and '/usr/bin/mysqladmin --defaults-extra-file=/etc/mysql/debian.cnf
ping' resulted in
Nov 11 02:15:24 localhost /etc/init.d/mysql[23427]:
^G/usr/bin/mysqladmin: connect to server at 'localhost' failed
Nov 11 02:15:24 localhost /etc/init.d/mysql[23427]: error: 'Can't
connect to local MySQL server through socket
'/var/run/mysqld/mysqld.sock' (2)'
Nov 11 02:15:24 localhost /etc/init.d/mysql[23427]: Check that mysqld is
running and that the socket: '/var/run/mysqld/mysqld.sock' exists!

..y no existe ese archivo.

Un saludo