If you encounter the issue with RAM usage again, check if there is a child process called ffprobe.exe running and consuming CPU and virtual memory.

Don't use default task manager for reviewing process, use Process Explorer from Microsoft (former Systinternals):
https://docs.microsoft.com/en-us/sysinternals/downloads/process-explorer

It provides a much better view of system processes.

If you see ffprobe.exe hanging under firefox.exe and consuming resources, kill it and then go to %LOCALAPPDATA%\Programs\Ant.com\Ant Video downloader and delete ffprobe.exe

You will have MPEG-DASH protocol disabled in AVD but there will be no more RAM issues.