This is a very good addon. First of all, it is VERY fast and provides lots of locations for a free VPN. However, it cannot be compared with any premium VPNs because of the price distance. Plus, sometimes the servers don't exactly work as they're supposed to. Cheers!

Why can't this VPN be connected and used?

overall great proxey , however i dont know whats the difference between FF version and chrome version , there are some elements that fails to load on FF but they are ok on chrome. some live feed elements doesnt load on FF using working vpn.