Ubuntu – Menubar text color and firefox black making is unreadable with Ambiance. How to fix this

Most themes will have a unity.css or something similar somewhere in gtk3/ folder.

Open that and look for Panel styles. You can easily change bg and fg colors there.

A sample from Zukitwo Gtk3 theme:

UnityPanelWidget,
.unity-panel {
        background-image: -gtk-gradient (linear, left top, left bottom,
            from (shade (@dark_bg_color, 1.5)),
            to (shade (@dark_bg_color, 1.04)));
        border-top-color: shade (@dark_bg_color, 1.6);
        border-style: solid;
        border-width: 1 0 0 0;

        -unico-border-gradient: none;
 }

 .unity-panel.menubar
 .unity-panel .menubar {
          color: #fff;
 }

These are the ones that need to be edited:

/usr/share/{theme}/gtk-2.0/gtkrc 

or

~/.themes/{theme}/gtk-2.0/gtkrc

change it to:

text_color:#000000
bg_color:#ffffff

is the code for black text and white boxes I am using Equinox Evolution Midnight on Sabayon linux with openbox and lxappearance does not change the colour of the white text on black text boxes or white text on white background in firefox (also libreoffice had reversed colours, yuck)

I hope someone spends less time figuring this out because of this answer.