--- a/browser/base/content/tabbrowser.css
+++ b/browser/base/content/tabbrowser.css
@@ -58,16 +58,20 @@
   direction: rtl;
   mask-image: linear-gradient(to right, transparent, black 2em);
 }
 
 tabpanels {
   background-color: transparent;
 }
 
+.tab-drop-indicator-box {
+  -moz-box-align: end;
+}
+
 .tab-drop-indicator {
   position: relative;
   z-index: 2;
 }
 
 /* Apply crisp rendering for favicons at exactly 2dppx resolution */
 @media (resolution: 2dppx) {
   .tab-icon-image {

--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -6329,17 +6329,17 @@
 
   <binding id="tabbrowser-tabs"
            extends="chrome://global/content/bindings/tabbox.xml#tabs">
     <resources>
       <stylesheet src="chrome://browser/content/tabbrowser.css"/>
     </resources>
 
     <content>
-      <xul:hbox align="end">
+      <xul:hbox class="tab-drop-indicator-box">
         <xul:image class="tab-drop-indicator" anonid="tab-drop-indicator" collapsed="true"/>
       </xul:hbox>
       <xul:arrowscrollbox anonid="arrowscrollbox" orient="horizontal" flex="1"
                           style="min-width: 1px;"
                           class="tabbrowser-arrowscrollbox">
 <!--
  This is a hack to circumvent bug 472020, otherwise the tabs show up on the
  right of the newtab button.

--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -822,16 +822,20 @@ html|span.ac-emphasize-text-url {
 #tabbrowser-tabs {
   -moz-box-align: stretch;
 }
 
 /**
  * Tab Drag and Drop
  */
 
+.tab-drop-indicator-box {
+  -moz-box-align: center;
+}
+
 .tab-drop-indicator {
   list-style-image: url(chrome://browser/skin/tabbrowser/tabDragIndicator.png);
   margin-top: -2px;
   z-index: 3;
 }
 
 @media (min-resolution: 2dppx) {
   .tab-drop-indicator {

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