I upgraded to Ubuntu 9.04 yesterday and one of the new features is a theme called New Wave. Here is what the file browser looks like.

Upon starting Firefox I was greeted by black text on a grey menu bar.

Thankfully Firefox can be customized with CSS by creating a userChrome.css file in the chrome folder of your Firefox profile.

The userChrome.css code
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */
/* menu toolbar text color */
menu > label.menubar-text {
color: #fff !important;
-moz-appearance: none !important;
}
/* menu toolbar text color when menu is open */
menu[open="true"] > label.menubar-text {
color: #1A1A1A !important;
-moz-appearance: none !important;
}
This fix also works on Komodo Edit 5.1 and SeaMonkey 2.
