Easy Inbox Zero (deprecated)
Rest assured that this this extension never, ever saved any user data or sent analytics.
The original README follows:
Achieve coveted Inbox Zero status without actually doing anything.
This extension removes the unread count from your Gmail inbox and title bar. You can even target specific folders!
By default, the unread count for your “Inbox” folder is hidden. To change which folders are hidden, click Options under the More Tools > Extensions page.
1: Will also run on Firefox as soon as WebExtensions support ships.