No, I agree. I've had 0 problems with it and it will be my first recommendations to newer users, as well. I always tell people to be careful with extensions though, as Mozilla states that they do not review every extension and you could add something nefarious.
I mean, that could be the same for Chrome, but it's been so long since I've touched that browser that I don't even know what it looks like anymore, let alone what their addon policy is.
I saw that Mullvad had a browser now. It's one of my favorite VPNs. I'd still use it if I didn't need port forwarding. Now I'm on AirVPN (for better or for worse) and run it through Eddie on Arch.