diff --git a/Casks/firefox-ja.rb b/Casks/firefox-ja.rb
new file mode 100644
index 000000000..ffe2b2860
--- /dev/null
+++ b/Casks/firefox-ja.rb
@@ -0,0 +1,7 @@
+class FirefoxJa < Cask
+  url 'https://download.mozilla.org/?product=firefox-latest&os=osx&lang=ja-JP-mac'
+  homepage 'http://www.mozilla.jp/firefox/'
+  version 'latest'
+  no_checksum
+  link 'Firefox.app'
+end