@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

.bookmark-item[label="about:config"],
#main-window[stylish-url="about:config"] #page-proxy-favicon,
#main-window[stylish-url="about:Config"] #page-proxy-favicon,
#main-window[stylish-url="about:config"] #fav-image,
#fav-image[style*="about:config"], 
#navigator-toolbox #fav-image[label="about:config"],
.tabbrowser-tab[label="about:config"] .tab-icon
{ width: 0 !important;
height: 18px !important;
padding-left: 18px !important;
margin-left: -3px !important;
background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABIAAAASCAYAAABWzo5XAAADJUlEQVR42oVUWyikYRh+5u93ijEkOSSUMikXGqacatyI1KYUUUtSigsX01yLG3dSKHIhF27I7SgurEltkpxlVihJjmHHOadvv+dtZ3bbdtuvpvm+7z187/O8z/tbSkpKPEqpTxaLBf9aQZv2+6v9/f39i6nX57S0tDx9CBkYYBgGIiMj5f/t7U3utK/Yn5+f8fHxIXveHR4e2s3Y2NhAYmKiOAeTREdHi+POzg729vZwf38v92FhYcjKyoLD4ZAHnp6eEBERgZubm++m1WpFamoqXl5exDk+Ph5+vx9TU1PilJubK3YGXlxcYGlpCVtbW2hra0NKSoo8eHp6ClYEDU2yJyQkYGZmBmNjY2hubkZ5eTlsNluoIkJtbGzEyMgIhoaG0NfXBxZycHDwKxGxrqysSJKBgQGUlpbi5OQEg4OD2N7eFlhMVFNTI3cNDQ2YnZ1FZ2cnlpeXYTBjZmamVNPb24uenh7U1tbi9fUVHR0dEtzd3Y3q6mpsbGyAfCYlJYltdXUVcXFxQgfL8+myVX9/v3I6nUonUBq30i+r+vp6FVwLCwsqJiZGbW5uKt01+c/OzlZXV1dKQ/Wb7BDX9PS0EEiI7Nb8/DzW19dDkpicnBTSc3JyxIdx4eHhUk1UVBSMoDbIfFFRkewnJiYEbnp6upzJwfDwMIqLi0NaWlxclMQUKzVoUFxaB9J+tpI/tjg5OVkC2BHykZGRAbvdLneBQABdXV3SWXaTXTVub2/x8PAgCTRuuWSpa2trGB8fR1VVFQoLC8V+eXmJubk5uFwuaD5RVlaG4+NjiTFZDZPxtdHRUVEtu0ae3G43WltbUVdXh93dXRGp1+tFZWWl6Ik+fJQVWtrb231aeC5y5PF40NTUJFohZMKlI/fU0fX1tZwpCQazSpLu8/m+mbzY39+XcWhpaRFBksj8/HxRNfVEO0ekoqIC5+fnoYHlCiY1ie/s7Exep8pJIMnmqEg3dAKtH5m5o6Oj0HAHFyVAasy7uzurFpUEkS9CKCgokDODmIjO3HNo//xuUQ66GKv5+Pjo1bNk+92BLeX5fx+0nx89i4b29QeoAtDBrbBMKAAAAABJRU5ErkJggg==) center center no-repeat !important; }