They are also wrong for the slackware.cs.utah.edu ftp site. A month or so ago, they got rid of the pub directory and moved everything up one level. Slackware has yet to update their site about it. Also if you go to http://packages.slackware.it
and search under the 64bit versions, nothing comes up (I used mozilla and firefox), also it linked the mozilla firefox package I found ending in program_name.tgz.txz.