Maysam,
Good news! I went into the back-end, and changed Artio SEF to completely skip JFBConnect. That fixed the issue I was seeing earlier where the Login With Facebook button wasn't behaving properly.
However, then, on the Login/Register page, RSFirewall was converting the email address in the form to an image. I had to disable the following setting:
"Convert email addresses from plain text to images"
Finally, I then created an account, and everything worked just fine. My account was not activated immediately, which is how you have Joomla configured.. so that's normal. Should you want Facebook user's to be automatically activated, you can do so in the User Configuration area of JFBConnect (the setting is Skip Joomla Activation). Not recommending it, just letting you know it's possible.
Anyways, good luck, and let us know if there's anything else you need. We really do appreciate the review you mentioned and any word of mouth you can spread. We do have an affiliate program as well, where you can earn 20% on any sales you send our way.
Best of luck to you!