Mica in Firefox looks so great (if backdrop is set to 2), in Nova design even better. Why don't you finally bring a switch to the settings menu, so everybody can activate it, without searching it in about:config?
In the default theme, there is absolutely no color difference between the focused and unfocused window. If you switch to a different color, you can see it at least a little difference.Please optimize this.
I use Firefox on Windows and Android and the flag is displayed correctly on both. I don't think Firefox has its own emoji management. So it seems that your system cannot display the flag correctly.
I have to change the language to English, then the widgets are back immediately. If I switch back to German, they disappear completely. Except for the weather widget.