Checker Plus for Gmail (Chrome, Firefox, and Edge) allows you to see notifications and read, listen to, or delete emails.

Checker Plus works without opening Gmail and supports the management of multiple accounts. This extension/add-on is a great way to continue browsing without the need to bring up Gmail to manage your emails.

Checker Plus Features:

Push Notifications

See the people emailing you just like in the Gmail chat notification, with an option to show their contact photos or your assigned photos for them

Voice notification: If you get an email while you're busy watching a movie or cooking dinner, this extension can optionally read it out loud, i.e., "Jason says, dinner at my place" It's great for the visually impaired

Option to monitor any Gmail or custom labels

Option to run this notifier in the background when Google Chrome is closed and still get new email alerts

Popup mail preview window to read, archive, mark as read, or delete emails without leaving the current tab (or option to go directly to your Gmail tab)

Supports offline view

Desktop sound or voice notifications when new mail arrives or add your sounds

Support for multiple Gmail and Google Apps accounts

Add voices

Similar:

How to Undo or Schedule an Email in Gmail

How to Send a Confidential Email in Gmail

How to Enable Offline Email in Gmail

How to Create a Signature in Gmail

How to Download Your Google Accounts Including Gmail