Definitely the first thing I thought of as well. My experience with this change has been so negative I've actually been seriously considering going back to Firefox, all these years later.
Sure, but my guess is they will either let me remap or have an extension that doesn't look at and control all my browsing data to do it. I haven't looked yet, though, so I might be wrong (I just remember having more flexibility when I used Firefox).
Firefox is currently in the process of changing their extension API to more closely match Chrome's