Follow-up fix for bug 458775 (actually use the right attribute). NPOTDFB.

toolkit/components/help/content/help.xul

@@ -184,7 +184,7 @@
                      align="center" pack="center">
           <label value="&searchtab.label;" accesskey="&searchtab.accesskey;" 
                  control="findText"/>
-          <textbox id="findText" type="timed" oncommand="doFind();"/>
+          <textbox id="findText" type="search" oncommand="doFind();"/>
         </toolbaritem>
       </toolbar>
     </toolbox>