Nautipolis for Thunderbird: High-quality, solid theme based on icons from art.gnome.org.
Fully compatible with from 5.0 upto latest nightly build (currently 27.0a1). Full support for Lightning/calendar.
add icons to buttons/menus/anywhere (CuteMenus - Crystal SVG not required)
Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.
German dictionary igerman98 (de_AT, Austria), for Firefox, Thunderbird und Seamonkey.
A full-featured scientific calculator which can be placed in any Firefox tool-bar or the Australis PanelUI.
Launchy will enable you to open links and mailto's with external applications...
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Results are in German and in English.
German dictionary igerman98 (de_CH, Switzerland), for Firefox, Thunderbird und Seamonkey.
Adds toolbar buttons to Mark All emails as Read, Mark Thread as Read, and Goto Next Unread Thread.
Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.
Gives an option to show the master password on input