Acidbrowser 

Acidbrowser is a powerful browser designed specifically for penetration testing purposes. The main reason why Acidbrowser was developed is the lack from the web security field. Acidbrowser project aims to bring all good web application security tools closer to the browser. While web testing proxies are good, they are very difficult to use with more complex/modern web applications. In order to solve this problem it is needed to understand the basics of HTTP but also quite a bit about the DOM and all modern web application technologies.