Snap to window in Chrome

I develop a lot of software simulations. Until now I've used Internet explorer because I was able to hide toolbars etc after pressing f11, then snap to window with Captivate. I'd get the same size window resized perfectly just capturing the screen with no toolbars. 

Well with IE going away, I am forced to use Chrome or Firefox. Although I can snap to window, I cannot get the capture area without the toolbars. When you press F11 with chrome, you can hide the toolbars ( by getting a full screen like IE) but then snap to window doesn't function.

I really don't want to manually place the sizing window every time I have to grab screens.

thoughts, suggestions?