Hi:
I upgrade my system today and after this I can't run firefox because it crash after few seconds.
I use MozillaFirefox-2.0.0.8-19 and also I download from Mozilla site the version 2.0.0.9 and the error is the same:
The program 'gecko' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
  (Details: serial 140 error_code 8 request_code 145 minor_code 3)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

Regards