MFH: r460989
www/seamonkey: switch 2.49.2
Changes: http://www.seamonkey-project.org/news
Security: f78eac48-c3d1-4666-8de5-63ceea25a578
Security: b7e23050-2d5d-4e61-9b48-62e89db222ca
Security: a891c5b4-3d7a-4de9-9c71-eef3fd698c77
Approved by: ports-secteam blanket