diff --git a/install.rdf b/install.rdf
index ea0dc66..c0ded4a 100644
--- a/install.rdf
+++ b/install.rdf
@@ -28,7 +28,7 @@
         <em:id>{3550f703-e582-4d05-9a08-453d09bdfdc6}</em:id>
         <em:minVersion>17.*</em:minVersion>
         <!-- As per valid version # https://addons.mozilla.org/en-US/firefox/pages/appversions/ -->
-        <em:maxVersion>51.*</em:maxVersion>
+        <em:maxVersion>50.*</em:maxVersion>
       </Description>
     </em:targetApplication>