css - Change input placeholder color darker

Follow this article (Style text input placeholder), i can change the color of the text input placeholder to red color. But it is always a light-red color, not red exactly.

Is there any way to make it a red color exactly?

update

The color on Chrome is red (this is correct), the color on Firefox is not red, it is light-red or blurred, i guessed that.

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EDIT (from the OP answer):

Please check this example (http://jsfiddle.net/LQkQG/), the color is red on Chrome, but light-red on Firefox.
I want the color on Firefox same with the Chrome.

Answer

I've found you need to override opacity.

::-webkit-input-placeholder { /* WebKit browsers */
    color:    red;
     opacity: 1 !important;
}