Bug 1242271 - The first item in the overflow panel doesn't need a margin-top as the panel has its own padding-top. r=gijs

MozReview-Commit-ID: KGUTQhqJ2CO

browser/themes/shared/customizableui/panelUIOverlay.inc.css

@@ -1057,7 +1057,8 @@ panelview .toolbarbutton-1,
 }
 
 panelview .toolbarbutton-1,
-.widget-overflow-list .toolbarbutton-1 {
+.widget-overflow-list .toolbarbutton-1:not(:first-child),
+.widget-overflow-list .toolbaritem-combined-buttons:not(:first-child) {
   margin-top: 6px;
 }