I'm sending this from it right now using the dark theme it comes with, dark bar (at the bottom), it has exactly what you're asking for! I'm really happy about this; dark with bar at bottom is what I've always wanted.

Im an idiot.... just tested it. Beautiful. Its nearly perfect now. Still blasts you with white in some situations but maybe thats due to the coding of the webpage as it loads. Im seriously impressed.

Actually... Id like a black theme as well as just a dark theme. Thanks.

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.