Facebook Like button cyclically opens and closes a popup window, facebook.com/connect/connect_to_external_page_widget_loggedin

I associated a Facebook account with my GaiaOnline account; we use Connect to accomplish this. I created a JS Like button for a page at FB's dedicated page: developers.facebook.com/docs/reference/plugins/like

The Like button's code was

Upon clicking the Like button in XP/firefox 3.6.13, while logged into Gaia and FB, a popup window rapidly opens and closes cyclically until the process is terminated. This beh开发者_JAVA百科avior is not repeatable on other windows machines, macs or chrome. Presumably this is Facebook trying to initiate a FB login page, per their third-party login process: developers.facebook.com/blog/post/312

My history identifies this page as "http://www.facebook.com/connect/connect_to_external_page_widget_loggedin.php?social_plugin=like&external_page_url=http%3A%2F%2Ftest135.open.dev.gaiaonline.com%2Fforum%2Fentertainment-discussion%2Fthe-roommate-what-s-the-best-thing-about-having-a-roommate%2Ft.67947263%2F".

A video of this transpiring is uploaded to Youtube: http://www.youtube.com/watch?v=1asJ4kMNL6w

What is causing the popup behavior, and what can be done to fix it?

Try enabling 3rd party cookies http://support.mozilla.com/kk/questions/761194#answer-127335