I use this theme from few years. With Firefox 57.0b14 there are a bug : Toggles buttons on find bar doesn't show as buttons but as simple text.
Edit: it's a Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1414693

When enabled, the gloss effect is evident but there isn't enough *black* showing. The inactive tabs show grey and the active tab with tool bar shows the gloss gradation, with grey predominating.

The end result is a theme that is LIGHTER than the preview picture conveys. That's a deal breaker for me. I *need* a dark UI to cut down the glare.

Privacy

Metallic Black and Red are so realistic here. Congratulations!

Very similar to my theme though!

Alles OK