Twitter No Birthday is a Chrome extension designed to eliminate birthdays from the Twitter "What's happening" box. Its primary function is to remove annoying and distracting birthday notifications, providing a cleaner Twitter feed. Currently in development, the extension aims to offer toggleable birthday hiding and more extensive customization options in the future. Users can expect a streamlined Twitter experience with reduced clutter once the full functionality is implemented.

This free Chrome extension, developed by Zane Shaw, falls under the Browsers category, specifically under Add-ons & Tools. While it may still be a work in progress, Twitter No Birthday shows promise in enhancing user control over their Twitter feed by allowing them to filter out unwanted birthday notifications effectively.