ⓔ Reflect the unread messages in your Gmail Inbox with Google Labs Unread message icon
By default, the favicon for Gmail is the boring old Gmail logo:
. There is a way to update that icon, and have the favicon reflect the number of unread emails in your Gmail inbox.
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To do this, you will need to go to the settings in Gmail by clicking on the gear icon,
, and then select the Labs list of settings:

Find the Unread message icon lab:

Click Enable, and then save changes. Now your tab will always show you how many unread messages you have in your inbox.