Remove the Sync promotion in the add-on install doorhanger

application/palemoon/themes/osx/browser.css

@@ -1338,41 +1338,6 @@ richlistitem[type~="action"][actiontype="switchtab"][selected="true"] > .ac-url-
     min-width: 27em;
 }
 
-.panel-promo-box {
-    margin: 10px -10px -10px;
-    padding: 8px 10px;
-    border-top: 1px solid ThreeDShadow;
-    background-image: linear-gradient(hsla(0,0%,0%,.15), hsla(0,0%,0%,.08) 6px);
-    border-bottom-left-radius: 3px;
-    border-bottom-right-radius: 3px;
-}
-
-@media (-moz-mac-lion-theme) {
-    .panel-promo-box {
-        border-top-style: none;
-        background: #f1f5fb;
-        color: GrayText;
-        box-shadow: 0px 1px 2px rgb(204,214,234) inset;
-    }
-}
-
-.panel-promo-icon {
-    list-style-image: url("chrome://browser/skin/sync-notification-24.png");
-    -moz-margin-end: 10px;
-    vertical-align: middle;
-}
-
-.panel-promo-closebutton {
-    border: none;
-    -moz-margin-end: -14px;
-    margin-top: -8px;
-}
-
-.panel-promo-closebutton > .toolbarbutton-text {
-    padding: 0;
-    margin: 0;
-}
-
 /* ::::: content area ::::: */
 
 #sidebar {