Rated 4 out of 5 stars

This is a wonderful plugin. I like how measure keywords density.
There is only a problem, you can't use 2 words or 3 words. In these days, with such strong competition, nobody tries to optimize for a singler word (keyword).
It would be very useful to work with two words.

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

Thank you for your feedback. I will have a look at this multiple keyword problem and will release a bugfix version.