I am not sure how you have your Awesome Bar set up or if you already created an Amazon keyword in Firefox. If you did, then you are correct it would be the same in that instance.
The goal is to create lots of keywords on eEntogo so you don't have to in Firefox. You can also create the keywords on the Entogo site and access them anywhere.
Please try some of the other keywords as well. It will give you an idea of how it works beyond Amazon.