Personally I didn't really like the latest changes in the Firefox mobile UI, especially with how it's managing tabs, but I'm sticking with it. I have also to recognize that with recent updates, it has stopped crashing (or at least the frequency is way reduced).
The "jump back in" feature and the "new tab" button not actually opening a new tab until you tell it where to go are what annoys me the most right now. I wish I could go back to the old, saner behavior, which was in Fenix (the "redesign") for a while.
