What about the menu bar? The author is kind enough to respond. I posted the issue in Github with screenshots.

Awesome, now I can finally use a dark theme and still easily spot the active tab.
Would it be possible though to not gray the titles of the inactive tabs? They are a bit hard to read like this on my screen. Especially if the whole browser-window is inactive.

rEALLY NICE THEME WILL USE THIS FROM NOW ON

Very clean and slick

it's perfect for ubuntu users, it mixes very well with system design.

looks good! keeps my Firefox matching my dark theme