PopTray is an email notification program for Windows desktops. It is a free and open-source application that checks multiple POP3, IMAP, and Hotmail accounts, and notifies the user when new messages arrive. It can also delete, forward, or respond to emails. Additionally, it has customizable sound and visual notifications, a task scheduler, and support for multiple languages. PopTray also has the ability to preview messages without the need for an email client.
Discontinued The extension is no longer updated. The latest version, 0.6.4.1, released in March 2011, is still available for download from Mozilla Addons.