I honestly have no idea which one is better, but after having it at the top (and all other applications seem to have their menu/nav on the top as well) for YEARS, it's a very hard sell to my muscle memory.
Faster is good, disabling my extensions simply sucks. Extensions were the main reason I use firefox on mobile at all.
Now I'm looking at obscure browsers like Kiwi just to get working extensions on a mobile browser.
I think Mozilla had to choose to either wait a long time to get full extension support and miss the train, or release early. I am also unhappy with not having the extensions I use, but I think this was the right choice. They plan to support the whole extension API eventually. Also aren't they the only ones who support extensions on Mobile?
Losing extensions really does suck, but you can at least install a lot of the big ones like uBlock, Dark Reader etc.
This is a fork that seems to be popular (enough to show up first in my search). It looks and feels like the Firefox I lost with 79. Firefox Sync brought most of my data back in minutes.
But Firefox Preview had a bug where often enough the back functionality did not work. I hope that is fixed, if not that might explain some of the complaints.
That's the "leave this Activity" button, personally I strictly don't use it navigating within an app because it's never clear if it's been overridden or not.
For mobile browsers, I always use "open in new tab" so I don't need to go back and can avoid guessing.
So I‘m the one that usually swipes (that somehow doesn‘t work either...) or click the back button (because that‘s what I‘m used to do). Even feeling dumb not realizing there‘s this „back for everything“ physical button on Android, it feels unnatural to me to use that one.