Secapps Suite is a penetration testing toolkit that is also available as add-on for Firefox. SecApps Suite can detect most common vulnerabilities in web applications. This tool can easily detect XSS, SQL injection and other web application vulnerability. Unlike other listed tools, it is a complete penetration testing tool in itself available as a browser add-on. It gives most of the features available in standalone tool.
Chrome: https://chrome.google.com/webstore/detail/secapps/cimdepkgkehkfalgddeedonnjaciffga
Edit and manage cookies in-broweser with one click. This tool helps quickly find out information about your cookies and change it.
Chrome: https://chrome.google.com/webstore/detail/cookie-editor/hlkenndednhfkekhgcdicdfddnkalmdm?hl=en