Well, for starters - they need to figure out why all the browser skinners (Edge, Brave, etc) keep using Chromium as a base instead of Firefox. I don't pretend to know the reasons - but I would wager there's some pretty good reasons Chromium is dominating that space.

Microsoft and Google are at total odds with each other - I can't imagine using Chromium as a base sent people skipping down the halls in Redmond.