HOW TO FIX YOUR PROBLEM:
With your browser open, click the MEDIA button on the toolbar above the address toolbar. This should open that annoying sidebar. Look at the bottom where it says MEDIA OPTIONS and click once, go to SETTINGS and uncheck "Play web media in the bar." That should stop the sidebar from popping up.
Another browser option that I found to be an improvement over IE is AVANT BROWSER. It's an Opera-based browser with multiple improvements and is free. I've used it for almost a year now. It has a pop-up blocker among other things. You can download it <a href="
http://www.avantbrowser.com/" target="_blank">here</a>.