HRKgame.com Drop Key Autojoin
Got a lot of refs from Ref Helper?
https://github.com/Tackyou/HRK-Drop-Key-Referral-Helper
Then this Autojoiner is for you
https://github.com/Tackyou/HRK-Autojoin/raw/master/hrkautojoin.user.js
WARNING: Please make sure you don't have it running the same time as autoref helper, it will collide.