User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6 I think multiple signatures support is an essential feature. You're testing useless (in my opinion) functions like opening messages in tabs, but you forget about signatures. Such feature should be available "out of box", without **** extension. Multiple signatures serverity is like session recovery in Firefox. There is an extension, but this should be available just after install. I completely don't understand this messy extension policy. Reproducible: Always

*** This bug has been marked as a duplicate of 73567 ***