# rpm -e firefox
( # rpm -e xulrunner ) ?
If you want to use yum, the repo file must point to "the old archive".
I.e. replace /etc/yum.repos.d/fedora* with this ( fedora11.repo ) :
Code:
[fedora11]
name=Fedora11-x86_64
baseurl=http://download.fedora.redhat.com/pub/archive/fedora/linux/releases/11/Everything/x86_64/os/
enabled=1
gpgcheck=1
[fc11-updates]
name=Fedora11-updates-x86_64
baseurl=http://download.fedora.redhat.com/pub/archive/fedora/linux/updates/11/x86_64/
enabled=1
gpgcheck=1
.