As spotted by Federico Trevisani, the second macOS Tahoe beta lets you enroll in beta testing of AirPods firmware updates directly on a Mac. A similar interface was already introduced on the iPhone and iPad with the first iOS 26 and iPadOS 26 betas.
First, connect your AirPods to your Mac. Next, open the System Settings app and click on the Bluetooth menu. Then, select the (i) symbol next to your AirPods. On the ensuing page, scroll down to the bottom and click on “AirPods Beta Updates. Finally, there is a toggle to enable beta firmware updates on your AirPods. Firmware updates will be installed when your AirPods are in their charging case and near the Мас.
Read more at MacRumors.com