Hello @디카족,
Thank you for your message. I am sorry you are having this problem.
First, if you suspect there is any possibility that your Adobe account has been compromised, please change your Adobe password immediately. I also recommend that you enable two factor authentication: Secure your Adobe account with two-step verification (2단계 인증을 사용하여 Adobe 계정 보호 ).
Do you know how many credits you had left before you were away? You might also want to double check your account page and make sure your subscriptions are correct. The date of the next charge to your credit card is the same date the credits refresh.
Having firefly open in a browser window should not consume credits. I have about 100 firefly tabs on multiple browsers (Edge, Chrome, Safari, and Firefox) and it does not cause a problem. Reloading a page should not cause a generation to happen.
My best,
droopy