>>747
指摘の通り目立ちすぎのため下記に変更した。
toolbarbutton.bookmark-item
{
-moz-appearance: none !important;
padding: 2px 6px !important;
margin: 1px !important;
border-radius: 4px !important;
border:1px solid rgba(255,255,255,0.0) !important;
border: 1px solid rgba(0,0,0,1) !important;
font-weight: 500 !important;
background-color: rgba(0,0,0,1) !important;
background-color: rgba(255,255,255,0.8) !important;
color: rgba(0,0,0,1.0) !important;
}