I don't think so... I use Firefox too, and I get the notifications. "www.canreef.com" is in my "Popups allowed" list. The other phpbb boards I frequent seem to work too, although I remember it was a bit of a pain getting each of them to work the first time.
Check Tools -> options -> "Allowed Site" (next to the "Block Popup Windows" check box, which is OK if it is checked).
Try that and see how it goes. If that doesn't work, let me know and we'll poke at this some more.
There IS a way to get it to work, I promise ..
