Very beautiful looking theme. I love dark themes with neon or bright colours and bright, colourful texts and symbols that offer a good contrast so they are easy to read / recognize as a contrast to the background image of the screen. This one even looks good on a 2560x1440 display.
I made an theme collection to share with some of my friends.

Here is a link to my Themecollection:
https://addons.mozilla.org/de/firefox/collections/13329745/Xenofox-Themecollection/