Image via Wikipedia

And another tool that may come in handy.  Written
for the Firefox browser, a tool that enables you to assess your website
(and others) for the Search Engine Optimisation and key words that are
being used. SEO for Firefox.

It's a plug in and appears at the bottom of the browser window.  Greyed out if not in use. 

Good practice suggests you leave it greyed unless specifically working on it.

Check out the latest feature "Firefox SEO Xray" – it shows up meta tags as
well as providing keyword density analysis. 

Just right click on a web page and scroll down to SEO for Firefox and arrow across to SEO Xray.  Cunning device!