Merry Christmas Radio should work in any modern browser as long as you enable your browser to access insecure content on MerryChristmasRadio.com.
Radio streams can only broadcast the large amounts of data needed via this kind of protocol. Because this communication is one way, there is no risk to your computer system.
In order for it to work, your browser must be set to accept insecure data from Merry Christmas Radio.
To do that, click on the icon next to the site name in the address bar of your browser:
A site settings option box should appear, scroll down to “insecure content” or similar:
Set it to “allow”. This applies only to MerryChristmasRadio.com:
Go back to the tab for MerryChristmasRadio.com, refresh and you should be able to use the controllers for the stream.