Is that only a problem with me that under Mozilla Firefox the Duelbits-Website does not load with this link?
They know about that problem. From twitter:
https://twitter.com/Duelbits/status/1482025058637910016We're aware that a very small percentage of our users are unable to connect to Duelbits. We're aware of this issue, and Ace is working to fix this problem within 24 hours. We apologise for any inconvenience caused.