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I'm using Jomsocial 3.2.1.2 on my test site (ukitadesign.com) and a live site (cloudservicescommunity.net)
When a new user registers (using firefox) in the test site it is fine but when in cloudservicescommunity.net it generates the attached error message after the 1st page of registration.
regards
Alan
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seem there a active session at your firefox, or session time out in idle time. please try to increase session time out at your server and joomla global configuration.
or it can be browser cache too. Because I can't replicate your issue.