Color input won't allow me to use "-moz-win-accentcolor"

it looks like the input box is limited to 7 chars, which is the exact char count for a custom hex color code including the hash (#). I want to use whatever Windows accent color I currently set for the highlight color (the -moz-win-accentcolor 'var').

Suggestion: Either remove the character limit or add an option to use native Windows accent color for highlight color