How to keep <select> dropdown open to test styles on <option> in firebug?

Question

How to keep <select> dropdown open to test styles on in firebug?

I'm trying to styling <option>

<select class="select">
    <option selected>Select</option>
    <option>Blue</option>
    <option >Red</option>
    <option>Green</option>
    <option>Yellow</option>
    <option>Brown</option>
</select>

But every time i need to open and see what's happening after changing css in firebug. I know it doesn't take much time to open an see the result.

But I'm just curious to know if there is any trick to keep the dropdown open

Answer 1

Make it multiple enabled.

<select class="select" multiple="multiple">
    <option selected>Select</option>
    <option>Blue</option>
    <option >Red</option>
    <option>Green</option>
    <option>Yellow</option>
    <option>Brown</option>
</select>