Thank for your comment!
You can watch videos made by some of my extension users:
https://www.youtube.com/watch?v=4gtdskw6sN8
https://www.youtube.com/watch?v=mmSHNS1hqL4
https://www.youtube.com/watch?v=lE56BlBcqvA
https://www.youtube.com/watch?v=QhDBfGHnCMc
About the number of users, I was lucky because my extension was introduced on the popular websites (http://i.imgur.com/0G0yGSJ.png).