You may have to use the latest (or even a beta) version of Google Chrome.
What is your version? If you click the wrench icon, click About Google Chrome, you will find your version.
Mine is 5.0.342.8 beta.
aaaah...that could be it. I am using an earlier version. I will update and get back to you
Updates indicate it is ;latest version.
So I downloaded and installed Chrome and got the add-on. Nothing. Nada. Just the regular FR with no extra buttons.