Four days ago Bitdefender Total Security started blocking Firefox for Windows 10 from connecting to gitcdn.xyz . A web search indicates gitcdn is a malicious ad server (at minimum). The BD blocking notices occur at regular intervals as the malware makes repeated attempts to connect. But BD is not eliminating the threat, BD is just blocking it. Here is the Malicious URL Firefox Win 10 is trying to connect to --- https://gitcdn.xyz/repo/NanoMeow/MDLMirror/master/hosts.txt
I tried a full system scan but that did not detect the problem.
Screenshot files are attached.