How do you EXIT full screen mode in Yosemite? I just discovered the new green button behavior in Yosemite that causes the window to go to full screen instead of maximizing it.  That's fine, and I can live with option+click to get the old behavior, but I can't figure out how to exit full screen mode.  I'm doing it in Chrome 38.0.2125.104, if that makes a difference.

The Esc key certainly doesn't work, and there's no longer the blue double arrow when you move the cursor to the upper right hand corner.

How do I exit full screen mode after entering it by clicking on the green window button on the upper left corner of the window?
Click the minimize/maximize button a second time or press Control-Command-F simultaneously. The button can be green or grey depending on how you have configured the appearance under the General pane of System Preferences.

To resize window, simply double-click window bar.

The best way to do this that I have found is to put the cursor in the upper left hand corner and wait a second. The green button reappears (you also get the top bar back in case you want to do other things than change the view.) and you can click on it to get back to normal view.