Nice looking theme. Works even on Big and High Resolution Screens (tested on a 2560x1440 Display). The text contrast in the url-bar could be better. Also it would be nice if the text in the bookmark bar would be more colourful.

Here is a link to my Themecollection:
https://cup.aihedy.com/de/firefox/collections/13329745/Xenofox-Themecollection/