diff --git a/programs/firefox.nix b/programs/firefox.nix
index cbd8d29..a4b1f7c 100644
--- a/programs/firefox.nix
+++ b/programs/firefox.nix
@@ -3,5 +3,25 @@
 {
   programs.firefox = {
     enable = true;
+
+    policies = {
+      # From https://discourse.nixos.org/t/declare-firefox-extensions-and-settings/36265/17
+      ExtensionSettings = with builtins;
+        let extension = shortId: uuid: {
+          name = uuid;
+          value = {
+            install_url = "https://addons.mozilla.org/en-US/firefox/downloads/latest/${shortId}/latest.xpi";
+            installation_mode = "normal_installed";
+          };
+        };
+        in listToAttrs [
+          (extension "bitwarden-password-manager" "{446900e4-71c2-419f-a6a7-df9c091e268b}")
+        ];
+        # To add additional extensions, find it on addons.mozilla.org, find
+        # the short ID in the url (like https://addons.mozilla.org/en-US/firefox/addon/!SHORT_ID!/)
+        # Then, download the XPI by filling it in to the install_url template, unzip it,
+        # run `jq .browser_specific_settings.gecko.id manifest.json` or
+        # `jq .applications.gecko.id manifest.json` to get the UUID
+    };
   };
 }