Just what I was looking for! Rated 5 out of 5 stars

Excellent work!

Just a question: It's normal that the search engine icon appears deformed (more height than width)?

This review is for a previous version of the add-on (0.3.1b). 

Usually its a sqaure image

The image should not be deformed. Usually the image is a 16x16 square image. Can you change your theme and see if its the same behavior?
You can send me a screenshot to debug if the problem persists.