I just found some links about using Javascript hosted by Google:
I had been wanting to use jQuery with GreaseMonkey, but it seems to require that you have a web-accessible copy of jQuery. I didn’t want to use other people’s bandwidth but wasn’t sure how else to do it. Here are the instructions:
Hopefully, I can post an example piece of code soon on how to put the two together, but I am not quite there yet. I hope the links help for now.