I have ended up using Microsoft Edge v2 (Chromium)
a lot recently.In part to attempt escape from Googles eco system.Edge can now use Chrome Extensions without any problems, but that also bring problems.If Google removes an extension from their store that now impacts Edge.
If there are vulnerabilities in an extension that now impact Edge.Edge has its own extension store but there are very few extensions that live there 
(so far)What I have started to wonder if how much of Chrome or Edge is Chromium.Is the extension hosting / executing code in Chromium? 
Is AMP in Chromium?What are the borders between the open source project and the closed source derivative?