Earlier quoted context omitted.
Bookmarks have become even more first-class now - just swipe up from your address bar anytime. Try it now ( in the Firefox preview). Also, I feel the opposite regarding the address bar position - give it a few days, you'll absolutely love it. Edge on Windows Mobile had the same position, and it was a very nifty and time-saving UX. You can now use the phone one-handed more easily, even for small-handed people.
Any UI element that you can't find by searching is not first class. In particular, if there's some gesture you have to randomly guess exists, it's a hidden feature for advanced users only.
There's a thumb that indicates dragability. They're about as hidden as a feature in a menu - that's not great, but it's a lot better than I understood before. (The preview took several hours to download and install on my phone. It's big, but it's not that big that it should've taken that long.)