There is a Firefox plugin as well, but I can't get it to work on my version 1.5.0.1.

Here is the link to DOWNLOAD
268K (I made this in about 10 mins with the try out - Crazytalk is easy to use, if a little buggy)
Run your anti-virus scanner though the zip, then unzip the 3 files, one a html, and click on this. Or 'open with IE' - if Firefox is your default browser. (As Firefox does not appear to work - remember that!!)