I get this error when I try to start up firefox:
XML Parsing Error: undefined entity
Line Number 30, Column 7: <menuitem id="context-copy"
It's a GTK window with black text with yellow background.
I've tried removing the .mozilla folder uninstalling firefox completely and deleting
/usr/lib64/mozilla and /usr/lib/mozilla folders.
So I tried running firefox under root, and it displays the same error plus:
Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details - 1: Failed to get connection to session: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)
So after long hours of frustration I created a new "test" user and firefox ran fine.
It still doesn't work on my old user account and root.
my system is "Linux localhost.localdomain 126.96.36.199-102.fc11.x86_64 #1 SMP Fri Dec 4 00:18:53 EST 2009 x86_64 x86_64 x86_64 GNU/Linux"