My browser is getting cut off (too big for my TV)

How do I adjust the size or aspect ratio of my browser in order to fit it on my screen? A few inches are being cut off the right side of the screen and a half inch or so from the top. I have a 42 inch plasma.

You can toggle ‘show header’ option in Internet > Settings. This will allow you to view the entire page.

Yes, I tried that but it did nothing for the right side of the screen that is getting cut off. Only affected the top of the screen. Any other suggestions?