How do you disable firefox built in adblock

So i use firefox as my browser and i have the adblock add-on which i disabled on Aternos.org website. The problom is even after disabling it (ive even tried uninstalling it) it still brings up the you have adblock enabled this i tried googling it, it said maybe tracking or cookies disabled that still the message pops up. for all my privacy settings i made aternos a exception so that shouldn't be a problem. Any help? i like the service and the message is annoying and id like to support.