Linux display Error while running firefox

While opening firefox " Xlib: extension "RANDR" missing on display message appeared  and failed to open display on my machine. I installed the gtk2-engines and passed this interesting error.

[root@mytest ~]# firefox
Xlib:  extension "RANDR" missing on display "xx.xx.xx.xx:0.0".
Error: cannot open display: xx.xx.xx.xx:0.0

Xlib:  extension "RANDR" missing on display ":0"




[root@mytest log]# yum install gtk2-engines
Loaded plugins: security
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package gtk2-engines.x86_64 0:2.18.4-5.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===========================================================================================================
 Package                    Arch                 Version                    Repository                Size
===========================================================================================================
Installing:
 gtk2-engines               x86_64               2.18.4-5.el6               RHEL6-DVD1               281 k

Transaction Summary
===========================================================================================================
Install       1 Package(s)

Total download size: 281 k
Installed size: 1.1 M
Is this ok [y/N]: y
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : gtk2-engines-2.18.4-5.el6.x86_64                                                        1/1
  Verifying  : gtk2-engines-2.18.4-5.el6.x86_64                                                        1/1

Installed:
  gtk2-engines.x86_64 0:2.18.4-5.el6                                                                    

Complete!



[root@mytest log]# firefox
Xlib:  extension "RANDR" missing on display "xx.xx.xx.xx:0.0".
Xlib:  extension "RANDR" missing on display "xx.xx.xx.xx:0.0".
GConf Error: 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: /bin/dbus-launch terminated abnormally without any error message)