X-Robots SEO Tool is a bookmarklet that can be utilized in either Firefox, Google Chrome, Safari and Opera on Windows and OS to find information vital to search engine optimization. The tool was built in collaboration with developer Cooper Harris and will continue to be developed to help SEOs. The beauty of this bookmarklet is that no updates need to be downladed since the tool is changed on our end. Just add the bookmarklet to your bookmark's toolbar, and begin to audit the web.
To use, just drag this link to your bookmark bar and then launch it on any page including Google search result pages.
More info: X-Browser SEO Tool