Earlier quoted context omitted.
Regardless who is technically at fault, the Firefox team is best placed to resolve the issue. It kind of surprises me that this is an issue at all. I was under the impression a large number of FF devs use Macbooks.
Yeah, well they know what the problem is but it fails to get a high enough priority to get solved: https://bugzilla.mozilla.org/show_bug.cgi?id=1407536
The discussion is all specific to that page. The biggest issue is that the animations are being driven from Javascript instead of CSS, so there's little we can do to optimize it.
The rest of the discussion is possible heuristics we can implement to optimize how we layerize the page. It would potentially help on this page, but might make things slower elsewhere.