Badge counter for Gmail is a productivity chrome extension. it's a free extension and is featured in Productivity, it has 237 active users since released its first version, it earns an average rating of 5.00 from 2 rated user, last update is 2299 days ago.
This extension displays the number of unread emails from multiple Google accounts in the badge area of the toolbar button which is equivalent to "is:unread label:inbox" search query. The extension does not store user's credential information for privacy concerns instead uses Gmail active session to perform searches (for the extension to operate you need to be logged-in into at least one Gmail account). Since Gmail allows multiple account access, this extension is also capable to display the number of unread emails for all the logged-in accounts. A user can define multiple search queries for each account from the options page and the badge number will be the total number of search items. When the toolbar button is clicked the most recent Gmail thread is opened (this action is configurable from the options page). To open other Gmail accounts, use the right-click context-menu items. The extension supports all the Gmail operators in the search queries hence you can define a complex search query and ask the extension to observe these queries. This extension is useful for those who need a powerful Gmail notifier, not a Gmail client.
You could download the latest version crx file or older version files and install it.
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small extension, no overhead, works fine, just what I was looking for. I modified the search-query to "in:inbox category:primary is:unread" to display "true" new unread's only; happy with it so far.