I'm not sure if I'm missing something, or doing something wrong, but following the author's directions, none of my links are mangled whatsoever - copying the go

I'm not sure if I'm missing something, or doing something wrong, but following the author's directions, none of my links are mangled whatsoever - copying the google.com link simply pasted google.com. I do have Javascript enabled as stated. I tried with each link in the article, and not a single one of them is redirecting via Viglink. (edit) Using Firefox 3.5 on Linux