Rated 5 out of 5 stars

Top! Functional and easy. Thank You!
I use an 4K monitor and the symbol seems a little bit small, but no problem at all: Better small than no Search Button!

This review is for a previous version of the add-on (1.0). 

I'm happy that you like my Add-on.
Unfortunately I have no influence on the size of the symbol - this is defined by Thunderbird itself. If you want to address this, maybe you can make a post here:
https://thunderbird.topicbox.com/groups/ux