Fullscreen mode would be good. And bookmarks seem like something of a car-crash. They're in there somewhere but it looks like Collections are easier to get to so obviously they're going to get used instead. I don't care what they're called - i just need a way of getting to frequently used urls. And it would be good if I could rename bookmarks/urls/items in collections because currently i'm stuck with whatever the site owner put there which means I end up with 4 links all called "train timetable" instead of "luton-london","london-luton","luton-tring","tring-luton". I would suggest firefox developers use both collections and bookmarks and see how many clicks they have to use, if they have to stretch their thumbs etc, and ask if there's a better way.

And..where to report this sort of thing? There seem to be about 7 different rival official locations.

F11 is full screen unless I'm missing something? It has been better than chrome in full screen for a while now bc if the floating Omni bar

Firefox for Android... Android.