diff --git a/modules/programs/firefox.nix b/modules/programs/firefox.nix
index 582143e7d..4d8bccaf0 100644
--- a/modules/programs/firefox.nix
+++ b/modules/programs/firefox.nix
@@ -101,9 +101,19 @@ in
           ]
         '';
         description = ''
-          List of Firefox add-on packages to install. Note, it is
-          necessary to manually enable these extensions inside Firefox
-          after the first installation.
+          List of Firefox add-on packages to install. Some
+          pre-packaged add-ons are accessible from NUR,
+          <link xlink:href="https://github.com/nix-community/NUR"/>.
+          Once you have NUR installed run
+
+          <screen language="console">
+            <prompt>$</prompt> <userinput>nix-env -f '&lt;nixpkgs&gt;' -qaP -A nur.repos.rycee.firefox-addons</userinput>
+          </screen>
+
+          to list the available Firefox add-ons.
+          </para><para>
+          Note that it is necessary to manually enable these
+          extensions inside Firefox after the first installation.
         '';
       };