This add-on worked great... but after the Firefox update I got an error that Windscribe is no longer supported. Switching back to an older version of Firefox, i.e. 66.02, did not help. It is not the developer's fault, as the add-on worked great till the update, but it is definitely Mozilla's fault

excelente

All web is blocked with this crap, I can´t open any page

It works and there are no real issues with it. The data cap on free users is very low at 2gb, i went through that in about an hour or two. They do not let you signup your email if its considered (by them) to be a disposable email, i used a mail.com email and it was rejected. this pretty much annoyed me because it is by no means a "disposable email". While it functioned it is pretty much useless as a free application.

The VPN is pretty nice for my needs, but having the whitelist adfiltering on even when the VPN's off can be pretty annoying. You have to either disable the extension outright (or, at least, disable the extension's adblock) or whitelist the site (or, at least, their advertising) if you trust the site and want to allow their ad on your face. (I'm usually relatively chill with ads so long as they're not intrusive.)