[MaxBarraclough]

And that changes the game a great deal. The innards of the browser matter.

For instance, on Windows, I usually use Firefox, but I use Edge to view Netflix, as (for whatever reason) Netflix supports Edge's EME pipeline better than the other Windows browsers. That's specific to the browser's innards, not to its skin.

Incidentally, the DefectiveByDesign guys aren't happy about the situation - https://www.defectivebydesign.org/edge-netflix-eme