select/option html tag dotted outline problem in firefox

Question

button::-moz-focus-inner { border: 0; } works for buttons...

what about for select/option html tag?

i try everything what is here: How to remove Firefox's dotted outline on BUTTONS as well as links?

but i open new question becouse there is talking about buttons...

Answer 1

  select, option {
        border: 0 none;
        outline: 1px none;
    }

always works for me.