I was delighted to see that IceCat is in Fedora 23 - thanks for making that happen! :)
I have a problem, though, that I wanted to ask about.
I'm using dark mode (as configured in GNOME Tweak Tool) in GNOME 3 (to alleviate eye-strain). Firefox, as of Fedora 23, has a dark toolbar when using dark mode. However, when I opened IceCat, I immediately noticed that the window title bar was bright. I suspect that this depends on IceCat being compiled against GTK+, version 2.
Would it perhaps be possible to update IceCat (on Fedora, or in general) so that it looks better for GNOME 3 users using dark mode?
Does anyone have any thoughts about this?