Like to have SEO (search engine optimization) tools at your fingertips? Then you need to install the SearchStatus add-on for Firefox. It makes it very easy to see information on several different website ranking services and also gives you some handy tools to use so you can improve your rankings too.
Here is a little more about the add-on from the developers:
Display the Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank anywhere in your browser, along with fast keyword density analyser, keyword/nofollow highlighting, backward/related links, canonical links, WHOIS, robots and more.
If you have your own websites and want to know how they rank on a number of different factors, this add-on is a great one to get. You can pick up SearchStatus from the Firefox add-ons website.