Have you registered or tried to start anything? That might be a good solution to see if you need it (I'm thinking if you get a captcha trying to put a trade through).

If it's the .Io site then it looks like you can put in a return address and that should work fine even without Javascript (Javascript is mainly for dynamic styling and autorefresh and a few other things).

My issue with it would be the lack of reviews? I can't find many.