Bug 253242 Some help GIFs converted to PNG p=giacomo.magnini@portalis.it r=me

extensions/help/resources/locale/en-US/customize_help.xhtml

@@ -286,7 +286,7 @@
   </tr>
   <tr> 
     <td colspan="2">
-      <img src="images/tabbed_browsing_bar.gif" alt="tab bar"/>
+      <img src="images/tabbed_browsing_bar.png" alt="tab bar"/>
     </td>
   </tr>
   <tr> 
@@ -400,7 +400,7 @@
   </tr>
   <tr>
     <td colspan="2">
-      <img src="images/tabbed_browsing_bar.gif" alt="tab bar"/>
+      <img src="images/tabbed_browsing_bar.png" alt="tab bar"/>
     </td>
   </tr>
   <tr>