MAB (Mozilla Amazon Browser) is geared towards those dedicated to shopping on Amazon. MAB shows the potential of what XUL can do as an application language. The application has been reviewed already on the O'Reilly network as a case study.
If you wanted to search for a particular product on Amazon, click on the search box at the top and click Search. It's that simple. When you click on a product in your search results, the product data will be display on the right side. You can even save your search results for later.
The MAB extension has the ability to add items to your shopping cart as well. However, if you wanted to complete a purchase, you need to visit the Amazon web site instead of completing the transaction through MAB.
MAB has taken the Amazon API and created an application around it. It is all of the Amazon inventory displayed through the extension. This is another extension that can be categorized as a Super Extension (Extensions that can be their own stand-alone applications).
The installation was a little difficult. I installed the extension under Firefox 22.214.171.124, went to MAB under the Tools pulldown menu, and clicked "Open in a Tab..." and....nothing happened. I tried the other option ("Open in a window"). Nothing. I downloaded the extension in Zip format and installed it manually. That seemed to work, but for new Firefox users, this may present a problem.
The extension, as I said before, is a great application (yes, application) written in a great browser language. There is also a remote application you can test drive before installing the extension.