width: 16px;
height: 16px;
margin-top: 4px;
- -moz-margin-start: -20px;
- -moz-margin-end: 4px;
+ margin-inline-start: -20px;
+ margin-inline-end: 4px;
border: none;
background-color: transparent;
background-image: url("mozapps/skin/plugins/contentPluginClose.png");