QaSCRIBE is a Firefox plugin that automatically builds test scripts by watching and recording a user's actions on a website. It allows users to search for a book on Amazon, add it to their cart, and verify the results. QaSCRIBE records the steps which can then be saved, run locally, or uploaded to the eureQa Cloud to test on different browsers. The document provides instructions on using QaSCRIBE to record searching for a product on Amazon, adding it to the cart, and verifying the results.