@-moz-document url(chrome://mozapps/content/extensions/extensions.xul) {

#extensionsItem {display:none!important}

#extensionsView richlistitem[selected=true] 
{padding:3px!important;background: none!important;color: #000!important;}

#extensionsView richlistitem 
{padding:3px!important;background: none!important;color: #000!important;}

#extensionsView richlistitem:not([selected=true]) [class*="Icon"], #extensionsView richlistitem:not([selected=true]) .addonIcon
{display:none!important;}

#extensionsView richlistitem[selected="true"] .addonIcon image,#extensionsView richlistitem[selected="true"] .addonIcon, .viewButtonIcon {width:22px!important;height:22px!important;}

* {font-size:10px!important;}

}