At least this two extensions works only then you use fingerprints:
veepn majdfhpaihoncoakbjgbdhglocklcgno
hoxx nbcojefnccbanplpoffopkoepjmhgdgh
Example: vpn1.xml
Not that I know of. You'll need to tunnel through the proxy to really check the connection. I either do a proxy checker site to make sure nothing is leaking, or I just do the simple GET request against the site(s) I'm working with/on.
