See summary, examples:
https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom&TicketID=2236551&ArticleID=2963803&ZoomExpand=0#2963803
https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom&TicketID=2244273&ArticleID=2963942&ZoomExpand=0#2963942
I'm using FF 3.0.6.
Version: unspecified
Severity: normal
OS: Windows Vista