diff --git a/programs/firefox.nix b/programs/firefox.nix
index 79e2516..225af87 100644
--- a/programs/firefox.nix
+++ b/programs/firefox.nix
@@ -1,5 +1,6 @@
 {
   config,
+  lib,
   pkgs,
   ...
 }: {
@@ -8,12 +9,28 @@
       enable = true;
       package = pkgs.firefox-wayland;
 
-      extensions = with config.nur.repos.rycee.firefox-addons; [
+      extensions = with config.nur.repos.rycee.firefox-addons;
+      let
+        # TODO: switch to yomitan
+        yomichan = buildFirefoxXpiAddon {
+          pname = "yomichan";
+          version = "20.5.22.1";
+          addonId = "alex@foosoft.net";
+          url = "https://addons.mozilla.org/firefox/downloads/file/3585060/yomichan-20.5.22.1.xpi";
+          sha256 = "sha256-/icvPD/nCJYS31owfYMD25QzFjsxAqapy/UAehhxsy8=";
+          meta = with lib; {
+            description = "Yomichan turns your browser into a tool for building Japanese language literacy by helping you to decipher texts which would be otherwise too difficult tackle. It features a robust dictionary with EPWING and flashcard creation support.";
+            license = licenses.gpl3;
+            platforms = platforms.all;
+          };
+        };
+      in [
         bitwarden
         i-dont-care-about-cookies
         refined-github
         sidebery
         ublock-origin
+        yomichan
       ];
 
       profiles."buffet" = {