A:AnswerThis television does not have a built in web browser. You can cast your Google Chrome browser or desktop to the television using the built in SmartCast.
A:AnswerYes. I have my Yamaha bass speaker going straight to the audio input with the TV sound on. Turning the sound on the TV causes no affect in the auxillary speaker. So, you can mute the TV and control the volume on just on your speakers autonomously.
A:AnswerAdd-on streaming devices can be added to the TV with one of the HDMI ports on back of the TV. You will then want to adjust the input on the TV screen as well to the same HDMI port you plug the streaming device in to.