Comment 2 for bug 1023767

A possible workaround it is modify box-shadow inset for input in dmedia/common.css

Original:
input, textarea, .inset {
    background: -webkit-linear-gradient(top, #333, #444);
    box-shadow: inset 0px 1px 5px rgba(0, 0, 0, 0.7), 0px 1px 1px rgba(0, 0, 0, 0.7);
    border-bottom:1px solid #555;
    border-top:1px solid #333;
}

New:
input, textarea, .inset {
    background: -webkit-linear-gradient(top, #333, #444);
    box-shadow: inset 3px 3px 5px rgba(0, 0, 0, 0.7), 0px 1px 1px rgba(0, 0, 0, 0.7);
    border-bottom:1px solid #555;
    border-top:1px solid #333;
}

This looks better on my screen resolution. But it still doesn't feel confortable having a inset shadow for input.