Safari don’t support playing .ogg files, which is a shame and a downright stupid decision by Apple, as this is a very popular and high quality open source audio format.
But, ALL the other browsers out there do.
Maybe it’s time to change to a decent browser without serious memory leaks and hopeless browser-extension policies on top of it all?
If I where you I’d try Firefox instead. Much better support for all standards, plus you have a massive amount of browser extensions to choose from.
From the screen-shot it looks as if you’re running an old version of Safari as well? Well, in this case it wouldn’t matter because there isn’t any .ogg support in the upcoming Beta either so it doesn’t seem to happen anytime soon.