FFAndroid (Fennec?) does strange things. A few examples:
1. You are on this web page in Fennec[1], and you want to do a web search. Click the address bar, type in your query, hit go. Sometimes, Fennec will start the progress bar and act like it is searching, but will draw another tab in the main viewport before resetting the progress bar and changing the url to the SERP you want. If you don't know its going to do that, it looks like Fennec completely ignored your search and loaded another tab.
2. Fennec will sometimes lose its cool and stop rendering pages. The UI layers will respond, you can open hamburger menus, tab listings and thumbnails, but no matter what tab you select, it no longer renders anything but a blank canvas in the viewport. You have to force close Fennec to restore normal behaviors.
3. Fennec will after a long time of being active lose its extensions like noscript et al, you have to force close and re-open to get them to show up in the hamburger menu again.
A good list, but it won't matter for much longer. Fennec is dying, Firefox Preview is coming.
As in, the core browser is available and seems to work fine, but for many people there's not much point in switching until it supports extensions. It won't replace Fennec until it does.
I personally never liked the nav bar and everything at the top. It loads sites much better than Brave and feels more precise for things like dismissing cookie/signup notifications, but navigating the interface always felt tedious. If they just had options for interface layout or nav bar contents it would be great.
What makes you say that? Firefox has been my primary mobile browser for over 5 years, am I missing something?