--- a/mail/components/compose/content/editorOverlay.xul
+++ b/mail/components/compose/content/editorOverlay.xul
@@ -907,17 +907,17 @@
       <menuitem id="AlignCenterItem" class="menuitem-iconic" label="&alignCenter.label;"
                 oncommand="doStatefulCommand('cmd_align', 'center')"
                 tooltiptext="&alignCenterButton.tooltip;"  />
       <menuitem id="AlignRightItem" class="menuitem-iconic" label="&alignRight.label;"
                 oncommand="doStatefulCommand('cmd_align', 'right')"
                 tooltiptext="&alignRightButton.tooltip;"   />
       <menuitem id="AlignJustifyItem" class="menuitem-iconic" label="&alignJustify.label;"
                 oncommand="doStatefulCommand('cmd_align', 'justify')"
-                tooltiptext="&alignjustifyButton.tooltip;" />
+                tooltiptext="&alignJustifyButton.tooltip;" />
     </menupopup>
   </toolbarbutton>
 
   <!-- InsertPopupButton is used by messengercompose.xul -->
   <toolbarbutton type="menu" id="InsertPopupButton" observes="cmd_renderedHTMLEnabler"
                  tooltiptext="&InsertPopupButton.tooltip;">
     <menupopup id="InsertPopup">
       <menuitem id="InsertLinkItem" class="menuitem-iconic" observes="cmd_link"