Checker Plus for Gmail

Checker Plus for Gmail displays new emails and the sender's contact photo, get desktop notifications or even listen, read or delete them without opening a Gmail tab. It also includes features like voice notification, option to monitor any Gmail or custom labels or even all mail, option to run in background when Google Chrome is closed and still get new email alerts, zoom in and out of emails which have large images, popup mail preview window to read, archive, mark as read or delete emails without leaving the current tab, desktop sound or voice notifications when new mail arrive, and Support for multiple Gmail and Google Apps accounts.

Requirements:

Google Chrome