Okay, I'm not sure which thing did it.
I made sure Firefox was closed before turning my game back on, so it could be that the game was crashing during puzzle #10 (crabs) OR it could be this:
I was hitting the space bar to pause the game: Spoiler below
To grab the 2 kids and put them on the crab and then grab an adult to catch it.
This time...I did not pause. I just put the kids on the grab and then dragged the adult to the crab, repeated this 5 times and it did not crash.
So either having Firefox off did the trick or not pausing did it.
Either way...I finally got that one