What is this?

This is a fork of AuthMe by axieum (https://github.com/axieum/authme)
It authenticates you and saves your access/refresh token to an encrypted JSON file (by default, you can make it not encrypt the file).
So that you can easily switch accounts.
No need to restart Minecraft anymore!

How do I use it?

Just click on the lock icon in the top left when you go try to connect to multiplayer servers.