Background: I have spamassassin set up on my email server. Any email for any account that scores over 5 goes to an inbox called 'mailtrap'. Mailtrap account forwards the messages/headers to spamcop, where I report them as spam (or not). Thunderbird is used to manage the mailtrap inbox (so I can move false spam from the SPAM folder to the HAM folder) and other inboxes via imap as well - so I can move spam that was not detected by spam assassin to the mailtrap, and/or move false spam back to the correct inbox. I believe, but am not certain, that this started occurring with the last thunderbird update. When I view the error console I get lots of messages like this when the spamassasin rule executes: Security Error: Content at moz-nullprincipal:{4d906652-23e0-4a1e-a633-7d7a9fb78876} may not load or link to imap://Beth@xxxxxxxx.net:993/fetch%3EUID%3E.INBOX%3E144691?header=filter&emitter=js&part=1.11. The spam reporter rule/filter is: 1 set to junk status 2 forward message to spamcop 3 mark as read 4 move to spam on mailtrap@xxxx.net The 2nd step is failing / generating those errors. Has something changed in firefox with respect to security context or something? I'd love to blame my antivirus program, but I can send mail from any of the accounts individually. I would expect that if the message were moved by Spam Assassin to MAILTRAP (serverside / incoming message processing rule) that there should NOT be any conflicts - but hey, I'm just a lowly geek, not a thunderbird developer. Help? Thanks in advance - John