Not yet rated

Installed under Firefox 2.0.0.3. (1) Notification worked but app failed to recognize that mail had been open and read: continued to announce mail already read. (2) Appears to reset gmail status flags for announced messages from already-opened to not-opened-yet after gmail tab loses focus. (2) Appears linked to appearance of spurious empty messages from email address of sender of most recently opened message. Resolution: uninstalled this extension!

This review is for a previous version of the add-on (0.5.3).