User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9) Gecko/2008052906 Firefox/3.0
Spun off bug 374978.
AMO should offer developers to see if there were other sessions with their account and be offered the possibility to sign out all other sessions.
For more info, please refer to the linked article.
Not something we have time for