Oh dear, it seems that F14’s cairo package is not properly implemented by GNOME and Firefox web browser — if your Gnome is giving you fits with its pull-down menus not entirely rendering and if animated GIFs are only showing their 1st frame and the rest transparent equating to an annoying “blink” effect, then this fix is for you:
$ vi /etc/yum.repos.d/fedora-13.repo
name=Fedora 13 – $basearch
$ yum –nogpgcheck –noplugins –disablerepo=* –enablerepo=fedora13 downgrade cairo cairomm cairo-devel cairomm-devel
Essentially, you are going from cairo-1.10 back to cairo-1.8. Re-start Firefox and voila, no more annoying GIF issues!