Prevent Unity window from getting focus upon Play

When I press the play button it takes a second or two before the game starts playing. During this time I often tab out of Unity to do something and then automatically get tabbed back into Unity as soon as the game actually starts playing. This is super annoying, is there any way of preventing Unity from forcing me back to the Unity editor window after it finishing building and actually plays the game? Some code or setting to block this window-focus signal from being sent to the operating system?