[edgy] firefox segfault & beryl symbol lookup

[Samuel Thurston, III]

Howdy gang,

I did a long overdue update yesterday since I've been stuck using
windows since my edgy partiton has been horked.

firefox and beryl were upgraded and I have two spankin new problems:

1) firefox segfaults on startup. it is utterly unusuable at the
moment. (how do i roll back to a previous version?)

2) beryl-manager leaves the following error messages when run from a terminal:

beryl: symbol lookup error: /usr/lib/libGL.so.1: undefined symbol: drmCloseOnce

I noticed during the update that some libgl1 package was removed but
didn't take close note of it.  now none of my 3d games work either.
So what do i need to (re?)install for this to work?

On the upside, beryl team finally got the "fallback window manager"
feature working so the beryl crash doesn't leave my machine useless
until i reboot.