Ok, just realized after a quick test:
Firefox adheres to GTK icon sets (and thus changes its icon theme with the GTK theme), but Thunderbird does not.
Therefore, Thunderbird doesn't need a Human/Tango theme package, but "simply" needs to follow the same GTK theme settings that Firefox already does.
Ok, just realized after a quick test:
Firefox adheres to GTK icon sets (and thus changes its icon theme with the GTK theme), but Thunderbird does not.
Therefore, Thunderbird doesn't need a Human/Tango theme package, but "simply" needs to follow the same GTK theme settings that Firefox already does.