minimizetotray

A powerful extension to minimize Windows versions of Firefox, Thunderbird, Mozilla Suite, and Nvu to the system tray.

Features:

Tray menus via right mouse click. MinimizeToTray provides quick access to many of Firefox and Thunderbird's most used features. For Firefox, easily view your Downloads or open a new browser window. For Thunderbird, compose new messages and view your Address Book while keeping it minimized all day to check for new mail.
Quick and flexible minimizing options. MinimizeToTray always allows you to send Firefox or Thunderbird to the tray by right-mouse clicking on the minimize button, or by choosing "File => Minimize to Tray" from the menu, or by pressing Ctrl+Shift+M from the keyboard. With the extension options, you can force the application to always minimize to the tray instead of the taskbar by selecting the checkbox inside the extension's options, restore using a single or double click, or minimize the application on close.
(In development) -Turbo option for Firefox and Thunderbird. MinimizeToTray implements this popular feature from the Mozilla application suite. Have a Firefox tray icon and menu always available, even if no browser window is open. Or have Thunderbird launch directly into the tray only to notify you if you receive mail.

mozdev.org