1.6.0 version was only for testing

extensions/cck/browser/resources/content/cckwizard/srcfiles/install.rdf.in

@@ -16,7 +16,7 @@ xmlns:em="http://www.mozilla.org/2004/em-rdf#">
             <Description>
                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
                 <em:minVersion>1.0+</em:minVersion>
-                <em:maxVersion>1.6.0.*</em:maxVersion>
+                <em:maxVersion>1.5.0.*</em:maxVersion>
             </Description>
         </em:targetApplication>