diff --git a/nixos/modules/programs/firefox.nix b/nixos/modules/programs/firefox.nix
index 8229affb1ad9..b041e1d072b0 100644
--- a/nixos/modules/programs/firefox.nix
+++ b/nixos/modules/programs/firefox.nix
@@ -118,8 +118,15 @@ in
         Some of these might be able to be configured more ergonomically
         using policies.
 
+        See [here](https://mozilla.github.io/policy-templates/#preferences) for allowed preferences.
+
         ${organisationInfo}
       '';
+      example = lib.literalExpression ''
+        {
+          "browser.tabs.tabmanager.enabled" = false;
+        }
+      '';
     };
 
     preferencesStatus = lib.mkOption {