Open the shield icon beside the address bar and set the security level to Safest. That turns scripting off across every site, which removes the single most reliable route anyone has to break anonymity from inside the browser.
Awazon is built to work at Safest. The login, the browsing, the checkout and the messaging all function with scripting off, so you give up nothing you need and you close the most important hole. Leave the dial at Safest for the whole session.
With Tor installed, verified and set to Safest, step one is done. Move to getting a verified address.