I figured out the problem. I run a plug-in on Firefox called adblock. With this plug-in enabled, your twitter widget does not work. The weird thing is, is that no other wordpress twitter plug-in, or html twitter feed grab that I tried, was affected by this plug-in. Just the one that was created by twitter itself.
I really like the official twitter widget, but I can’t use it. I am afraid that too many people out there also use some sort of adblock on their browsers and would therefore not see my twitter feed.
Thanks though.