diff --git a/Casks/firefox-beta-gb.rb b/Casks/firefox-beta-gb.rb
index 5d39adf46..4ed6b682b 100644
--- a/Casks/firefox-beta-gb.rb
+++ b/Casks/firefox-beta-gb.rb
@@ -1,11 +1,17 @@
 cask :v1 => 'firefox-beta-gb' do
-  version '40.0b2'
-  sha256 'a8040975c75e85e7fc93162b4cb0e09c2e4d936380a89da5ba80561f90076024'
+  version '41.0b6'
+  sha256 'b02546810197a52f855cfeaada98138092ebac96f84889db5089b30f2b5f7b36'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=en-GB"
+  name 'Firefox'
   homepage 'https://www.mozilla.org/en-GB/firefox/beta/'
   license :mpl
   tags :vendor => 'Mozilla'
 
   app 'Firefox.app'
+
+  zap :delete => [
+                  '~/Library/Application Support/Firefox',
+                  '~/Library/Caches/Firefox',
+                 ]
 end