Excellent SEO Tool! Rated 5 out of 5 stars

SenSEO allows webmasters to inspect on-page SEO elements such as title, tags, and keyword density. It really is an excellent tool to analyze a page and find areas for improvement.

Works flawlessly in Firefox 16.

This review is for a previous version of the add-on (2.5.0). 

Thank you for this nice review :-)