For casual use Windscribe is as good if not better than paid for VPN's that I've used.

So happy with the ad blocker functionality.

It is recommended from my secure and encrypted e-mail Protonmail

Виндскрайб вообще в целом - один из моих любимых сервисов.

ok for now

Fantastic unstable connection when i am use another DNS with this settings:
user_pref("network.trr.mode", 3);
user_pref("network.trr.uri", "https://dns.nextdns.io");
user_pref("network.trr.custom_uri", "https://dns.nextdns.io");
user_pref("network.proxy.socks_remote_dns", true);
Can you fix this problem?

Just the best. If you have problems, just reinstall. 2 years now works perfect the paid version. As i know free version too.