It's an… interesting choice of a machine for hosting, especially from Mozilla. Regarding the report itself, I am only occasionally a frontend developer, but I'

It's an… interesting choice of a machine for hosting, especially from Mozilla. Regarding the report itself, I am only occasionally a frontend developer, but I've never had any issues with flexbox regarding Chrome vs. Firefox. Although I haven't tested the usual suspects: Safari, Edge, and IE. Some of my friends, who are fulltime frontend developers, have been saying for a while now that Safari is “the new IE 6” in that it's the one causing the most issues and lagging behind in standards implementation. IE “proper” is almost dead, outside of a few specific domains, and non-“legacy” Edge is pretty close to Chrome.