Bug 395432: document the addition of Manage Add-ons on the Main pref panel. r=jwalden, a=mconnor

browser/locales/en-US/chrome/help/firebird-toc.rdf

@@ -444,6 +444,7 @@
         <li><Description rdf:ID="prefs-startup" nc:name="Startup" nc:link="prefs.xhtml#startup"/></li>
         <li><Description rdf:ID="prefs-downloads" nc:name="Downloads" nc:link="prefs.xhtml#downloads"/></li>
         <li><Description rdf:ID="prefs-system-defaults" nc:name="System Defaults" nc:link="prefs.xhtml#system_defaults"/></li>
+        <li><Description rdf:ID="prefs-addons" nc:name="Add-ons" nc:link="prefs.xhtml#addons"/></li>
       </Seq>
     </nc:subheadings>
   </Description>

browser/locales/en-US/chrome/help/prefs.xhtml

@@ -110,6 +110,13 @@ Contributors:
     whenever an application tries to display a web page.  You can also click the
     <em>Check Now</em> button to do a check right now.</p>
 
+  <h3 id="addons">Add-ons</h3>
+  <p><em>Manage Add-ons</em><br/>
+    To install or uninstall, update or configure add-ons, click the <em>Manage
+    Add-ons</em> button to open the Add-ons manager. This is also accessible
+    from <span class="menuPath">Tools &gt; Add-ons</span>. A detailed
+    description of add-ons and the Add-on manager is available <a href=
+    "customization.xhtml#add_ons">here</a>.</p>
 
 <h2 id="tabs_options">Tabs &pref.pluralCaps;</h2>
 <p><em>New pages should be opened in:</em><br/>
@@ -679,7 +686,7 @@ Contributors:
       than the one in &brandShortName;, click the <em>Security Devices</em>
       button.</p>
 
-<div class="contentsBox"><em>27 September 2007</em></div>
+<div class="contentsBox"><em>07 October 2007</em></div>
 <p>Copyright &copy; &copyright.years; Contributors to the Mozilla Help Viewer Project.</p>
 
 </body>