It's certainly very vivid, but the colors of the tabs and the bar are well balanced. I'm doing a little update today...

I finally managed to bring out "Fractal Senzune Alfacoder 4K" a full color re-release of my classic theme. I massively updated all the davailable colors on firefox, tabs, tabs, bars and whatnot.
Let me know what you think.

You're welcome.
Today I had time to update this theme. It has a resolution of 3840x2160 pixels and a coloring scheme of all Firefox elements: tabs, sidebars, search bar, customization toolbar and pop-up menus. Unfortunately, Firefox won't let me load it because it is a "duplicate". I should according to them update the existing one. But doing so would displease users who like it, the way it is.... Dilemma! I need to look up how to do it.

Let's say it's not exactly relaxing... Rather it is energizing!
;-)