I agree with P.B., this theme made perfect decisions on darkness and contrast control. Comfortable and stable. The original theme (by elibroftw) choosed black in tab background, but I like this theme's color selection, dark gray. I'm using (vanilla) Firefox with compact mode, and this fits perfectly.

I couldn't find a theme like this, that looks great even on Vanilla Firefox. The dark theme is just perfect, Waterfox has nothing special actually.

I don't use Waterfox but this extension has the perfect darkness for my mac, it's not too dark for the text to be too hard to see and it's not light grey, it is perfect! I love it with Firefox Nightly.