AMO requires the max version be an actual release version number

Author: lukeis

javascript/firefox-driver/extension/install.rdf

@@ -15,7 +15,7 @@
             <Description>
                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
                 <em:minVersion>3.0</em:minVersion>
-                <em:maxVersion>66.*</em:maxVersion>
+                <em:maxVersion>43.0</em:maxVersion>
             </Description>
         </em:targetApplication>