For Firefox 3, what is the best text-to-speech add-on?

[Advice Pro]

Most of the text-to-speech add-ons for Firefox haven't been updated for Firefox 3. I want one that doesn't sound too computerized and, even more importantly can be assessable via shortcuts and the right-click menu.

[ThomasGHenry]

bump

[GraysonPeddie]

Here's the direct link for you to try:
Firevox add-on for Firefox (http://almondmendoza.com/wp-content/uploads/2008/12/speak-it.xpi)

Source: "For Firefox 3, what is the best text to speech add-on?" (http://askville.amazon.com/Firefox-text-speech-add-on/AnswerViewer.do?requestId=37231623)