diff --git a/Casks/firefox-beta-cn.rb b/Casks/firefox-beta-cn.rb
index ce3414932..109310ef2 100644
--- a/Casks/firefox-beta-cn.rb
+++ b/Casks/firefox-beta-cn.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-cn' do
-  version '38.0.5b1'
-  sha256 '62438a8eff9b2c31ecd45e2a0f5a7e916473d2ee158ee56e89925b691e43e986'
+  version '39.0b5'
+  sha256 '95c8beb8007f89ebaabacdab4c1e3a494e50e05c3c6e7d96a52c68c57b5ae58f'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=zh-CN"
   homepage 'https://www.mozilla.org/zh-CN/firefox/beta/'
diff --git a/Casks/firefox-beta-de.rb b/Casks/firefox-beta-de.rb
index 4486436fa..ee4bf799f 100644
--- a/Casks/firefox-beta-de.rb
+++ b/Casks/firefox-beta-de.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-de' do
-  version '38.0.5b1'
-  sha256 '7b019293087e9852e192665a4ec538d6b2109b558f937b74b13e073f14287cf6'
+  version '39.0b5'
+  sha256 'c3e72cff81322e290296db2c1c031e77800c2a5cb879d12c023f3c5c118dbad3'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=de"
   homepage 'https://www.mozilla.org/de/firefox/beta/'
diff --git a/Casks/firefox-beta-gb.rb b/Casks/firefox-beta-gb.rb
index d85c06ecd..5c601e6f6 100644
--- a/Casks/firefox-beta-gb.rb
+++ b/Casks/firefox-beta-gb.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-gb' do
-  version '38.0.5b1'
-  sha256 '6e95c61bc50208dc61165005dcbc5bded08e6a204bbe2c32aecec7a4af42dfd7'
+  version '39.0b5'
+  sha256 '8171c2a05e303b0366020f7dde59a65bafaf16dff7d4a63b84b912610ee6539d'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=en-GB"
   homepage 'https://www.mozilla.org/en-GB/firefox/beta/'
diff --git a/Casks/firefox-beta-ja.rb b/Casks/firefox-beta-ja.rb
index 87c564a22..30c27f10f 100644
--- a/Casks/firefox-beta-ja.rb
+++ b/Casks/firefox-beta-ja.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-ja' do
-  version '38.0.5b1'
-  sha256 'e3da6aa7b564b09221b84576884f62be5d079320faba8276030d93ac44b2a229'
+  version '39.0b5'
+  sha256 'a57af5e2a3daf5d9fd51ff51378ac1731fa0e86ff9638a6c539aa7dfd3c16a1a'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=ja-JP-mac"
   homepage 'https://www.mozilla.org/ja/firefox/channel/beta'
diff --git a/Casks/firefox-beta-ru.rb b/Casks/firefox-beta-ru.rb
index ef64b4312..48974550c 100644
--- a/Casks/firefox-beta-ru.rb
+++ b/Casks/firefox-beta-ru.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-ru' do
-  version '38.0.5b1'
-  sha256 '46f75be229783b3378ca9f893db852426b7c57f1256c843d680b724709cd2f2f'
+  version '39.0b5'
+  sha256 '5195c859b083a003a8fd825f8d115f338ce0c7a91d2bed50ed37f0ba27d778a1'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=ru"
   homepage 'https://www.mozilla.org/ru/firefox/channel/#beta'
diff --git a/Casks/firefox-beta-uk.rb b/Casks/firefox-beta-uk.rb
index 47ac5769e..902ba3854 100644
--- a/Casks/firefox-beta-uk.rb
+++ b/Casks/firefox-beta-uk.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta-uk' do
-  version '38.0.5b1'
-  sha256 '5079c8f030ba0ba9669fbce189a13bb4a1c7e2e2f58bf56e5e823109089ac7f2'
+  version '39.0b5'
+  sha256 '8e9206d9a9a0dd6cc7e881bf4738478671275674f8e1a14051b433d6fca0fb1c'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=uk"
   homepage 'https://www.mozilla.org/uk/firefox/channel/#beta'
diff --git a/Casks/firefox-beta.rb b/Casks/firefox-beta.rb
index 8c32acc3a..006578db8 100644
--- a/Casks/firefox-beta.rb
+++ b/Casks/firefox-beta.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-beta' do
-  version '38.0.5b2'
-  sha256 '51054175be49e60f1210ab76cd9cd46116d9c272efc3181c660f277f8a727216'
+  version '39.0b5'
+  sha256 'a57af5e2a3daf5d9fd51ff51378ac1731fa0e86ff9638a6c539aa7dfd3c16a1a'
 
   url "https://download.mozilla.org/?product=firefox-#{version}-SSL&os=osx&lang=en-US"
   homepage 'https://www.mozilla.org/en-US/firefox/channel/#beta'
diff --git a/Casks/firefox-esr-cn.rb b/Casks/firefox-esr-cn.rb
index 1baea2624..a21cea036 100644
--- a/Casks/firefox-esr-cn.rb
+++ b/Casks/firefox-esr-cn.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-esr-cn' do
-  version '38.0'
-  sha256 '3ab26baccdd923ad1c3dbbf418045321f3a9db10022f407c61a45dffcaf1c9d7'
+  version '38.0.1'
+  sha256 '01ce3fde0c70388f5ac432bc745f474bd5b2ab76556d687c636224f31d3bd952'
 
   url "https://download.mozilla.org/?product=firefox-#{version}esr-SSL&os=osx&lang=zh-CN"
   homepage 'https://www.mozilla.org/zh-CN/firefox/organizations/'
diff --git a/Casks/firefox-esr-ru.rb b/Casks/firefox-esr-ru.rb
index 6056d605f..d732b9c3f 100644
--- a/Casks/firefox-esr-ru.rb
+++ b/Casks/firefox-esr-ru.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-esr-ru' do
-  version '38.0'
-  sha256 'af4e2aef6ed0cd43ef5f2fb1214e34b5ffa79cf3b090a3eca12db77cec672240'
+  version '38.0.1'
+  sha256 'ebc6f10a0672dd2c0283e19783066c33a0b3df1869808f148afdc5b0139ab12c'
 
   url "https://download.mozilla.org/?product=firefox-#{version}esr-SSL&os=osx&lang=ru"
   homepage 'https://www.mozilla.org/ru/firefox/organizations/'
diff --git a/Casks/firefox-esr-uk.rb b/Casks/firefox-esr-uk.rb
index b6ca95e49..d0454c374 100644
--- a/Casks/firefox-esr-uk.rb
+++ b/Casks/firefox-esr-uk.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-esr-uk' do
-  version '38.0'
-  sha256 '66697d73b9d9c138953c7933fdcfdb5ac37535c35506526c441832ac2a1730c0'
+  version '38.0.1'
+  sha256 'a403737175eee03b449762aef6d87f1ddf889747e65ed6384214123bd31d7896'
 
   url "https://download.mozilla.org/?product=firefox-#{version}esr-SSL&os=osx&lang=uk"
   homepage 'https://www.mozilla.org/uk/firefox/organizations/'
diff --git a/Casks/firefox-esr.rb b/Casks/firefox-esr.rb
index 937e4f2e6..9c4339795 100644
--- a/Casks/firefox-esr.rb
+++ b/Casks/firefox-esr.rb
@@ -1,6 +1,6 @@
 cask :v1 => 'firefox-esr' do
-  version '38.0'
-  sha256 'c25cc2c83b4c11676828f9aae6f2be7dcaee8cf75747203b9dc06a90cbf2697d'
+  version '38.0.1'
+  sha256 '04bda1d76edc6d92faf418f464f969067fa73e4f0b52d966363db6af18ccd274'
 
   url "https://download.mozilla.org/?product=firefox-#{version}esr-SSL&os=osx&lang=en-US"
   homepage 'https://www.mozilla.org/en-US/firefox/organizations/'
diff --git a/Casks/firefox-nightly-ja.rb b/Casks/firefox-nightly-ja.rb
index cd9fd00db..1729bf2a6 100644
--- a/Casks/firefox-nightly-ja.rb
+++ b/Casks/firefox-nightly-ja.rb
@@ -1,5 +1,5 @@
 cask :v1 => 'firefox-nightly-ja' do
-  version '40.0a1'
+  version '41.0a1'
   sha256 :no_check # required as upstream package is updated in-place
 
   url "https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/latest-mozilla-central-l10n/firefox-#{version}.ja-JP-mac.mac.dmg"
diff --git a/Casks/firefox-tw.rb b/Casks/firefox-tw.rb
index bdfd95344..69b907a9f 100644
--- a/Casks/firefox-tw.rb
+++ b/Casks/firefox-tw.rb
@@ -3,8 +3,15 @@ cask :v1 => 'firefox-tw' do
   sha256 :no_check
 
   url 'https://download.mozilla.org/?product=firefox-latest&os=osx&lang=zh-TW'
+  name 'Firefox'
   homepage 'http://mozilla.com.tw/firefox/new/'
-  license :oss
+  license :mpl
+  tags :vendor => 'Mozilla'
 
   app 'Firefox.app'
+  
+  zap :delete => [
+                  '~/Library/Application Support/Firefox',
+                  '~/Library/Caches/Firefox',
+                 ]
 end