diff --git a/xpi/install.rdf b/xpi/install.rdf
index d6bdecb..5dd2fca 100644
--- a/xpi/install.rdf
+++ b/xpi/install.rdf
@@ -23,7 +23,7 @@
       <Description>
         <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <!-- Firefox -->
         <em:minVersion>6.0</em:minVersion>
-        <em:maxVersion>999999999.0</em:maxVersion>
+        <em:maxVersion>25.0</em:maxVersion>
       </Description>
     </em:targetApplication>
   </Description>