diff --git a/extensions/firefox/install.rdf b/extensions/firefox/install.rdf
index 5d010b003..aef00eeb7 100644
--- a/extensions/firefox/install.rdf
+++ b/extensions/firefox/install.rdf
@@ -13,7 +13,7 @@
     <em:targetApplication>
       <Description>
        <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
-       <em:minVersion>59.*</em:minVersion>
+       <em:minVersion>59.0a1</em:minVersion>
        <em:maxVersion>61.0a1</em:maxVersion>
      </Description>
     </em:targetApplication>
@@ -31,7 +31,7 @@
     <em:targetApplication>
       <Description>
        <em:id>{aa3c5121-dab2-40e2-81ca-7ea25febc110}</em:id>
-       <em:minVersion>59.*</em:minVersion>
+       <em:minVersion>59.0a1</em:minVersion>
        <em:maxVersion>61.0a1</em:maxVersion>
      </Description>
     </em:targetApplication>
diff --git a/extensions/firefox/update.rdf b/extensions/firefox/update.rdf
index b74b618c7..0560c8a20 100644
--- a/extensions/firefox/update.rdf
+++ b/extensions/firefox/update.rdf
@@ -14,7 +14,7 @@
             <em:targetApplication>
               <RDF:Description>
                 <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id>
-                <em:minVersion>59.*</em:minVersion>
+                <em:minVersion>59.0a1</em:minVersion>
                 <em:maxVersion>61.0a1</em:maxVersion>
                 <!-- Use the raw link for updates so we we can use SSL. -->
                 <em:updateLink>https://raw.githubusercontent.com/mozilla/pdf.js/gh-pages/extensions/firefox/pdf.js.xpi</em:updateLink>
@@ -25,7 +25,7 @@
             <em:targetApplication>
               <RDF:Description>
                 <em:id>{aa3c5121-dab2-40e2-81ca-7ea25febc110}</em:id>
-                <em:minVersion>59.*</em:minVersion>
+                <em:minVersion>59.0a1</em:minVersion>
                 <em:maxVersion>61.0a1</em:maxVersion>
                 <!-- Use the raw link for updates so we we can use SSL. -->
                 <em:updateLink>https://raw.githubusercontent.com/mozilla/pdf.js/gh-pages/extensions/firefox/pdf.js.xpi</em:updateLink>