Thanks to have switched from Chrome to Firefox! To use a webcam, you need its own driver. Check your webcam driver in Control Panel > Device Manager > Imaging device, right-click on the element corresponding to your webcam and click on Properties. You can update driver or ask to search one. For music, it depends on the website you use, and the music format you want to play. A good solution is to install [http://www.videolan.org/ VLC media player], an extension for multi-format player is provided with.