diff --git a/xpi/resources/install.rdf b/xpi/resources/install.rdf
--- a/xpi/resources/install.rdf
+++ b/xpi/resources/install.rdf
@@ -43,7 +43,7 @@
       <Description>
         <em:id>{92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}</em:id>
         <em:minVersion>2.0</em:minVersion>
-        <em:maxVersion>2.16a1</em:maxVersion>
+        <em:maxVersion>2.18a1</em:maxVersion>
       </Description>
     </em:targetApplication>