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Mozilla CEO quits, org pivots, but what about Firefox?
(www.theregister.com)
This is a most excellent place for technology news and articles.
As far as I know, Firefox Mobile doesn't have a bottom toolbar so I'm not really sure what you are referring to there (at least, there's no bottom toolbar in Firefox on Android where I'm using it), and the notification/battery area is definitely not part of Firefox. It sounds like your phone's system UI is providing those elements, and it's likely not really fair to blame problems with the system UI on Firefox.
Firefox on Android can be configured with the address / tab bar at the bottom - possibly this is what they're referring to, but that also doesn't dynamically change per site as far as I'm aware.
It does have a bottom toolbar and was configured like that by default before. They must have changed the default some time ago.
System UI is just standard Google Pixel UI and it reacts to apps signaling to it what color theme it's in. Firefox just isn't signaling it correctly. It also should be reacting normally to dark mode toggle but it doesn't because the main Fx toolbar doesn't change to light mode in the mornings. No other app has this issue.