Solved-Firefox Login via Social not possible

Testing with Firefox 28.0 on a Mac (and a few other versions for Windows that we have available), we can't recreate this issue. I also tested on your site with Firefox, and the login window displayed as expected.

I'm not sure what's going on, but here's what I'd recommend:
* Disabling any add-ons in Firefox. Some add-ons will alter the output on pages, and I can only guess that some add-on is affecting our popup.
* Try from a completely different computer using Firefox.

Let us know what happens, or more information about Firefox (version, OS, any add-ons) and we'll gladly try to help further, but this is a new issue to us that we've never seen or heard of before.

Thanks,
Alex

Glad to hear we could help you narrow things down. If you run into any other issues, just let us know!

Finally, if you haven't already, please consider leaving a rating and review for JFBConnect, or our support, on the Joomla Extension Directory. It certainly isn't required, but is very appreciated:
extensions.joomla.org/extensions/social-...ook-integration/7215

Thanks,
Alex