diff --git a/Casks/thunderbird-gl.rb b/Casks/thunderbird-gl.rb
new file mode 100644
index 000000000..46257ab25
--- /dev/null
+++ b/Casks/thunderbird-gl.rb
@@ -0,0 +1,10 @@
+cask :v1 => 'thunderbird-gl' do
+  version '31.4.0'
+  sha256 '36fe75ceae334fabbff74ed49a30755b87a9e2f1ec6af54551794151bd74021f'
+
+  url "https://download.mozilla.org/?product=thunderbird-#{version}&os=osx&lang=gl"
+  homepage 'https://www.mozilla.org/gl/thunderbird/'
+  license :mpl
+
+  app 'Thunderbird.app'
+end