This tweak displays an unread-message count overlaying the Gmail icon in yourChrometab.

In theUnread message iconsection, selectEnable, then selectSave Changes.

Now, your Gmail Chrome tab will display the number of unread messages you currently have.

Gmail inbox screen with Settings highlighted

Gmail settings with See all settings highlighted.

Gmail settings with Advanced tab highlighted

Gmail settings with Enable and Save Changes highlighted

Gmail tab highlighted displaying number of unread messages