Currently devtools offers the layers tab, which shows the page's layer breakdown. Unfortunately, these layers don't always seem to map to actual CC composited layers. Additionally, it's hard to see which layers are drawn (using memory) and which are not drawn (empty / solid-color).

We should either update the layers tab or add a new way of viewing the amount of actual layers a page is responsible for.

Additionally, we should add heuristically determined action items that a page could take to reduce layer explosion.