Firefox, or FreeBSD?

[Kurt Buff]

I'm visiting various web sites, and having a stupid little issue which
is really annoying.

FreeBSD 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #4: Sun Dec 14 22:08:22
PST 2008     root@:/usr/obj/usr/src/sys/GENERIC  amd64

FireFox 3.04.

For instance, if I go to http://www.wsj.com, among others, it's
constantly beeping, as the little headline scroller at the top of the
page updates.

I can't find anywhere in the menu items, or in FF help, on how to turn
the beeping off, and it's driving me nuts.

Anyone have a hint for me?

Kurt