diff --git a/mozilla/browser/themes/gnomestripe/browser/browser.css b/mozilla/browser/themes/gnomestripe/browser/browser.css
index 8bf4ebf968a..784a48a62c9 100644
--- a/mozilla/browser/themes/gnomestripe/browser/browser.css
+++ b/mozilla/browser/themes/gnomestripe/browser/browser.css
@@ -1180,11 +1180,12 @@ tabpanels {
 
 /* In-tab close button */
 .tab-close-button > .toolbarbutton-icon {
-  -moz-margin-end: 0px !important;
+  /* XXX Buttons have padding in widget/ that we don't want here but can't override with good CSS, so we must
+     use evil CSS to give the impression of smaller content */
+  margin: -3px !important;
 }
 
 .tab-close-button {
-  -moz-appearance: none;
   -moz-margin-end: 6px;
   padding: 0px;
   border: none;
@@ -1207,6 +1208,10 @@ tabpanels {
   border: none;
 }
 
+.tabs-closebutton > .toolbarbutton-icon {
+  margin: -3px !important;
+}
+
 /* All tabs menupopup */
 .alltabs-item > .menu-iconic-left > .menu-iconic-icon {
   list-style-image: url("chrome://global/skin/icons/folder-item.png");