This video from Joshua Bardwell, who is a great resource if you want to learn really technical details about drones and their components, explains that the Betaflight Configurator Chrome app has been discontinued. Well, technically, ALL Chrome apps have been discontinued. Because Google decided to kill them off. In the video below, he will show you how to download the new standalone Betaflight Configurator app, which is pretty much exactly the same as the Chrome app, except that it runs natively in the Operating System of your computer instead of in Chrome.
Get the new Betaflight Configurator installer here: https://github.com/betaflight/betaflight-configurator/releases