or download this
$ Xvfb :99 &
$ DISPLAY=:99 firefox --display=:99 &
...
Can't call method "addProgressListener" on an undefined value at /usr/
+local/share/perl/5.10.1/WWW/Mechanize/Firefox.pm line 574, <DATA> lin
+e 1.
I, MOZREPL : Client closed connection : 127.0.0.1:46358
I, MOZREPL : Client closed connection : 127.0.0.1:46357