The captcha's should work with just javascript (it's the only thing I have enabled in firefox, and they display just fine. They are however loaded from some google server, so it could be you are using a plugin that is preventing cross site scripting (XSS) that is blocking this, or a form of anti-tracker that is blocking all google traffic, but that being said, the registration page "should" work including captcha's (I just tested this).
Edit: it might also be just enough to allow cookies from google while visiting that page. (You can still remove em afterwards.)
Also notice that you would only need to enable cookies/javascript temporarily to register the account, if you do not like cookies (and there are good reasons not to like them) you can delete them afterwards.
On an unrelated note, I do not believe we have any cookies originating from Israel, it could be another site set those.