Description of problem: firefox-11.0-1.fc18.x86_64 requires in its dependencies gecko-libs(x86-64) = 11.0-3-1 Accordingly to https://bugzilla.redhat.com/show_bug.cgi?id=797348#c3 this is an invalid spec which is causing a confusion between yum and rpm (see other comments to bug 797348 for what is happening). OTOH xulrunner-11.0-3.fc18.x86_64 provides 'gecko-libs(x86-64) = 11.0' and dependencies cannot be resolved. Version-Release number of selected component (if applicable): firefox-11.0-1.fc18.x86_64.rpm
You're right, I wonder how does it even build in koji?
Should be fixed now.