I do not believe Firefox, Google Chrome, or other Chromium-based browsers use the native macOS Game Controller framework. As such these browsers must add support for gamepads individually, and Nintendo controllers are popular enough that they get supported by all. If you are running macOS Sonoma, you can try turning on the 'Increase controller compatibility' option for your 8BitDo Ultimate 2.4G Wireless Controller. Open the system Settings app, navigate to the Game Controller settings, click on your 8BitDo Ultimate 2.4G Wireless Controller in the list, use the (+) button at the bottom of the left column to add app-specific customizations for Firefox/Chrome, and toggle ON the 'Increase controller compatibility' switch. This will result in the 8BitDo Ultimate 2.4G Wireless Controller appearing as an Xbox controller to Firefox/Chrome, if Firefox/Chrome support Xbox controllers.
Topic:
Graphics & Games
SubTopic:
GameKit
Tags: