I tried installing Dreamgrow Scroll Triggered Box and it worked kinda well, but there are somethings I want to point out:
The testing (show only for admin) didn't work for me.
After a few minutes I start getting port 80 server errors on the website. This happens while working in the backend of WordPress or trying to save a post.
Another thing I noticed is that while this plugin is active, the UI to insert a link on a post gets all screw up.
I can be wrong, but everything started when I installed this plugin and everything went back to normal once I deactivated it.
Any help will be appreciated.