What’s the difference with the regular Firefox for Android?
If you like Firefox I'd give it a go. I've never been a fan of the normal Firefox mobile app, but recently switched back from Chrome so I think it's a nice alternative.
Add a bookmark via overflow (three dots) then star at the bottom.
Access your bookmarks via overflow (three dots) -> Your Library.
I'm not really clear why it has both bookmarks and collections.
Edit: how to add a bookmark changed from the bottom shelf to the overflow menu with today's update
https://github.com/mozilla-mobile/fenix/issues/574#issuecomm...