firefox - Reload page every so many to check for new topics

I'm looking for an addon for firefox, that reloads a page on a set interval, in this case a forum topic overview, and checks if a certain word has appeared. And then alerts me if it has.

I've tried "ReloadEvery", but that just reloads that page and you have to check yourself.
I've also run in to "Check4Change", but that works with text already present. Mostly intended for bidding/selling sites like ebay and amazon.

So, neither of those are doing it for me. Does anyone know if what I'm looking for exists?

And no, the forum does not have an RSS I could add to my reader.

Answer

Check out Greasemonkey - it can almost certainly handle your task, but you'll have to write some javascript to accomplish it: https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/

This script looks like it's close to what you want:

http://userscripts.org/scripts/review/34287

And here's a discussion about how to detect text within a span in html, which would get you the other half of your functionality:

http://userscripts.org/topics/2940

So you'd want to use the text detection code in 2940 with the auto-reload of 34287.