For example, press Alt or F10 to open the menu from the menu bar, In "Edit", you should expect "Undo", "Redo", "Cut", "Copy" and "Delete" to be disabled in many cases. You can't select them, as expected, but they have the same text color as other menu items.

The corresponding CSS is: http://hg.mozilla.org/mozilla-central/file/baa9c64fea6f/toolkit/themes/linux/global/menu.css#l36 So GrayText resolves to the same as MenuText.

(In reply to Mike Hommey [:glandium] from comment #1) > The corresponding CSS is: > http://hg.mozilla.org/mozilla-central/file/baa9c64fea6f/toolkit/themes/linux/ > global/menu.css#l36 > > So GrayText resolves to the same as MenuText. So here we come: http://mxr.mozilla.org/mozilla-central/source/widget/gtk/nsLookAndFeel.cpp#244 244 case eColorID_graytext: // disabled text in windows, menus, etc. 245 case eColorID_inactivecaptiontext: // text in inactive window caption 246 gtk_style_context_get_color(mBackgroundStyle, 247 GTK_STATE_FLAG_INSENSITIVE, &gdk_color); 248 aColor = GDK_RGBA_TO_NS_RGBA(gdk_color); 249 break;

Pick up menu label widget to fetch inactive (gray) color.

Try build: https://treeherder.mozilla.org/#/jobs?repo=try&revision=8012d33b7c71