I have just upgraded from the release candidate 3 to final i believe there was something like 13 updates or so,the only issue i have encountered is a missing dependencies one,which is gecko-libs.
It seems to be a common issue from looking at other posts and not just fedora 8.
I had to uninstall firefox version 8 to allow updates,and then reinstall version 9.
but the issues with gecko-libs are still there.
So at the moment i cannot view the about fedora button as it brings up (Failed to execute child process "yelp" (No such file or directory)
I cannot install yelp because of the missing gecko-libs.