Already wrote about increasing everything in Mozilla. The problem with this decided, set the height and line-height. But now the next problem arose. The text "test" looks normal everywhere, but for some reason in Mozilla Firefox it is shifted 2 pixels down ...
#box_head { overflow: hidden; background: url('../images/box/box_head_bg.png') #3d3d3d; border-top: 1px solid #868686; border-bottom: 1px solid #3d3d3d; padding: 10px; color: #fff; font-size: 12px; font-weight: bold; height: 15px !important; line-height: 15px !important; } <div id="box_head">test</div>