Comment 6 for bug 856939

hi again,
unfortunately i don't have good news. i looked into various other themes and it seems like thunderbird bases the icon-color on the menu-background color. other bright themes with dark menus have the same problem and i even found a theme that has the opposite setting (dark theme with bright menus) and it had the opposite outcome (dark icons on dark toolbar).

so all in all i believe this has to be fixed in thunderbird and i'm sorry that there's nothing much i can do about it in the theme. as a workaround you can install a different thunderbird theme in the meantime. (i don't have enough experience with that, but maybe it's possible to do a thunderbird theme that only replaces those few monochrome icons...)