New Add-ons manager. (Bug 561600)
Drag URL/file to/from SeaMonkey´s Download Manager. (copy/move to desktop/folder) (Bug 192728)
Save multiple messages as individual files in directory. (Bug 555972)
Make Search, Folder Location and Views widgets for MailNews customizable toolbars. (Bug 521927)
WebM video is now supported for HTML5
