On newish TV's If you get a calibration BluRay you can copy your settings to other inputs i.e. Your Fios input. The problem with the TV's browser is often times you can't make fine adjustments to the picture because a lot of the settings are greyed out, and/or some of the picture modes won't be available while using the browser.
My TV allows all adjusments it has alot from advance to expert, I can run the browser full screen and have Fios or PS4 on the lower corner picture in picture style.
Toshiba 50L 73000 240hz Smart Tv,