Firefox calendar lives! With some confusion

I was pleased to discover today that there is an updated calendar plug-in for Firefox 1.5. But Mozilla needs to get the word out better. In fact, my copy of Firefox 1.5 was still telling me the old calendar plug-in wasn't working -- it continued to tell me this when it was receiving updates from Mozilla. It also wasn't able to find the new plug-in. You can find it here.