Yes, and the commenter claims that in this context this is actually good because it halted chrome/chromium's dominance in the internet (and I actually agree). It may sound paradoxical, but context is important imo.

That is to a large degree correct.

I even thought it wasn't necessary to test them separately but I recently heard from someone with more and more recent experience that some differences exist, particularly around prefixed css attributes. Can't say for sure though, but that was why I wrote my comment above somewhat defensively.