On the execution of yum -y update I received: yum -y update Loaded plugins: presto, refresh-packagekit Dropbox | 951 B 00:00 adobe-linux-i386 | 951 B 00:00 http://repos.fedorapeople.org/repos/spot/firefox4/fedora-15/i386/repodata/repomd.xml: [Errno 14] HTTP Error 404 - Not Found : http://repos.fedorapeople.org/repos/spot/firefox4/fedora-15/i386/repodata/repomd.xml Trying other mirror. Error: Cannot retrieve repository metadata (repomd.xml) for repository: fedora-firefox4. Please verify its path and try again Firefox runs fine and looks good! just yum from the command line doesn't work.