+html|input[type="checkbox"]:checked + html|label:before {
+ background-image: url("chrome://global/skin/in-content/check.svg#check"), linear-gradient(#fff, rgba(255,255,255,0.8)) !important;
+}
+
+xul|checkbox[disabled="true"] > xul|*.checkbox-check,
+html|input[type="checkbox"]:disabled + html|label {