Thought so, it's a problem with Firefox and your best bet (and your only bet) is to reinstall it, or rather upgrade it. Version 3.04 is the latest stable release. If you upgrade you wont loose your bookmarks, if you reinstall it you will loose everything, so download latest version and install over the top of current.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.
sj