The OP already said he did that, Richard.
F11 gets the full screen but sometimes, especially in Firefox, it doesn't do anything unless you minimize the window, maximize it then hit F11. It's a workaround.
Also, that enlarge button in the lower right corner isn't the same thing. It enlarges the screen the same way right clicking and zooming does and tends to blur the image a bit. I would set your display resolution to 1200 x 800 if your graphics card supports it. The detail is amazing. GL