A good friend sent me a Christmas email that has a variety of Christmas carols in it, but I got the following message when I opened the email.

....additional plugins required to display all the media on this page....click here to instal plugin.

I'm not happy simply clicking on this and downloading an unidentified program from an unidentified source. How do I find out what plugin is required and how to get it without clicking the X on this notice?

I have pictures on this email, but no sound. I do have sound on all my other emails that require it.