Quick Help

you can't.

 

With most windows (Safari for sure), the green button will first resort to the actual size of the page you are viewing. After that, if the previous size was smaller than the size of the site viewed, it will revert to that previous size. However, if the window is full screen and larger than the site, the green button will revert to the previous, smaller size, and then when pushed again revert to the size of the site, and not the original larger or full screen size.

In Firefox, at least for me, the first time I hit the green button it went from full screen to the tiny box. After resizing it (to something bigger, but smaller than full screen), upon hitting the button it reverted to full size, and when hitting it again reverted to the previous (not the tiny box) size I made it.

This was while viewing the google homepage which may or may not have affected the "actual size of page" resizing I referred to with Safari.

Hopefully not too confusing.