freebsd 7.1 & firefox 3.0.5

No package 'x11-xcb' found
No package 'xcb-glx' found

Где бы их найти? # whereis x11-xcb

x11-xcb:

# whereis xcb-glx

xcb-glx:

входят в стандартный набор Xorg proto's
http://xcb.freedesktop.org/

обращайте внимание на /usr/ports/UPDATING
в частности по вашей проблеме

20090123:
  AFFECTS: users of x11/libxcb
  AUTHOR: flz@FreeBSD.org

  Libxcb shared library version was bumped from 1 to 2.  You need to
  rebuild any consumer of libxcb.so.1 or some applications will be
  linked against two versions of libxcb once libX11 is upgraded.

  For portupgrade users:

    # portupgrade -rf libxcb