@mddarkness2009 Not automatically, but there is a small speaker button on any tabs with videos/music playing that you can quickly press to silence them.
@transtitans Opera doesn't synchronize data with Chrome or any other browser. What Opera may do is to import (some) data from the default browser during the installation process or from other installed browsers, at any time, by using the proper tool.
I don't know if Opera can import extensions from Chrome, it's not listed among the things that can be imported.