Poor performance and doesn't work with a number of web sites.

Firefox Version 61.0.1 for ubuntu 18.04
Cannot login, as widget closes when moving from login to password field.
The same issus as with NordVpn

You could have an accessible description on your site on how to work with this add-on instead of disperse information mixed with pub and a cartoon for children.

If one does not pay, will have restrictions which put this add-on at the bottom of most others, and with such a reduces bandwidth, this useless add-on can be taken as an abusive pub. I see too many anonymous reviews, almost all of them with five stars. Have they noticed what I mentioned? I also see these so many anonymous reviews as a very big bite on your credibility. A proved hoax.