FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities.
Fake Filler is form filler that fills all form inputs with fake and randomly generated data.
Hacktools is a web extension facilitating your web application penetration tests, it includes cheat sheets as well as all the tools used during a test such as XSS payloads, Reverse shells to test your web application.
Wappalyzer is a browser extension that uncovers the technologies used on websites. It detects content management systems, eCommerce platforms, web servers, JavaScript frameworks, analytics tools and many more.