Firefly getting extremely hot. Help..

Mine gets pretty warm too. I used a dremel tool and cut out the back door plastic cover as much and possible along with some slots on the sides to give it a little more contact with fresh air. 

Jking

I turned down the screen brightness.

I also turned off the led lights.

Both helped it still get pretty warm but not hot.

The case for the firefly is basically the same as the older Gopro 3. If you still have one of those, they came with an open back plate replacement for the waterproof case. It will fit on the firefly case. Just a simple swap out. This will cool the firefly.