update:3-31-20:
Ok i get it. this is not the protonvpn program itself but an addon for it i am guessing. this review is for the program itself-protonvpn.
Biggest problem with this add-on is that it is incomplete software and relies on additions from Microsuck. After three days of battling microsuck bad information and problems (break up microsuck!). I finally go protonvpn installed. The other major problem is that most of its servers are easily identified as proxies which makes most of protonvpns servers WORTHLESS for registration on sites that block proxies-many do. Suggest you include the necessary programs with your package so users don't have to hunt all over and tear their hair out dealing with microsuck. Or maybe MS and you are one in the same?

old:
Where do these vpn "developers" get their programmers, from the local homeless shelter? Cannot install cuz it's crippleware that requires multiple third party installs under windows which will not install because they did not bother to check the proper security certificates for the included installs.
Why do these "scientists" they call themselves, haha waste peoples time with crap software that is crippleware and wont install without microcrap (more lame programmers) software added. Just another lame "free" vpn. so far mozilla has not censored or deleted my reviews, hope that continues. I have no conflict of interest here, only my experiences. This app is a PITA to install and not that fast either, even with their free trial that is supposedly fast, it is not.