diff --git a/Mozilla/Firefox-Linux.installscript.recipe.yaml b/Mozilla/Firefox-Linux.installscript.recipe.yaml
index 6ec6254..0a174b4 100644
--- a/Mozilla/Firefox-Linux.installscript.recipe.yaml
+++ b/Mozilla/Firefox-Linux.installscript.recipe.yaml
@@ -11,14 +11,6 @@ Input:
 MinimumVersion: "2.3"
 ParentRecipe: com.github.jgstew.download.Firefox-Linux
 Process:
-  - Processor: com.github.jgstew.SharedProcessors/BigFixSetupTemplateDictionary
-
-  - Processor: com.github.jgstew.SharedProcessors/TemplateDictionaryAppend
-    Arguments:
-      dictionary_name: template_dictionary
-      append_key: file_sha256
-      append_value: "%filehasher_sha256%"
-
   - Processor: com.github.jgstew.SharedProcessors/TemplateDictionaryAppend
     Arguments:
       dictionary_name: template_dictionary
diff --git a/Mozilla/Firefox-Mac.cask.rb b/Mozilla/Firefox-Mac.cask.rb
new file mode 100644
index 0000000..7c58709
--- /dev/null
+++ b/Mozilla/Firefox-Mac.cask.rb
@@ -0,0 +1,64 @@
+# https://github.com/Homebrew/homebrew-cask/blob/master/Casks/f/firefox.rb
+# brew install --cask --verbose ~/Library/AutoPkg/Cache/com.github.jgstew.cask.Firefox-Mac/firefox.rb
+cask "firefox" do
+    version "{{version}}"
+
+    language "en", default: true do
+      sha256 "{{file_sha256}}"
+      "en-US"
+    end
+
+    url "https://download-installer.cdn.mozilla.net/pub/firefox/releases/#{version}/mac/#{language}/Firefox%20#{version}.dmg",
+        verified: "download-installer.cdn.mozilla.net/pub/firefox/releases/"
+    name "Mozilla Firefox"
+    desc "Web browser"
+    homepage "https://www.mozilla.org/firefox/"
+
+    livecheck do
+      url "https://download.mozilla.org/?product=firefox-latest-ssl&os=osx"
+      strategy :header_match
+    end
+
+    auto_updates true
+    conflicts_with cask: [
+      "firefox@beta",
+      "firefox@cn",
+      "firefox@esr",
+    ]
+    depends_on macos: ">= :catalina"
+
+    app "Firefox.app"
+    # shim script (https://github.com/Homebrew/homebrew-cask/issues/18809)
+    shimscript = "#{staged_path}/firefox.wrapper.sh"
+    binary shimscript, target: "firefox"
+
+    preflight do
+      File.write shimscript, <<~EOS
+        #!/bin/bash
+        exec '#{appdir}/Firefox.app/Contents/MacOS/firefox' "$@"
+      EOS
+    end
+
+    uninstall quit: "org.mozilla.firefox"
+
+    zap trash: [
+          "/Library/Logs/DiagnosticReports/firefox_*",
+          "~/Library/Application Support/com.apple.sharedfilelist/com.apple.LSSharedFileList.ApplicationRecentDocuments/org.mozilla.firefox.sfl*",
+          "~/Library/Application Support/CrashReporter/firefox_*",
+          "~/Library/Application Support/Firefox",
+          "~/Library/Caches/Firefox",
+          "~/Library/Caches/Mozilla/updates/Applications/Firefox",
+          "~/Library/Caches/org.mozilla.crashreporter",
+          "~/Library/Caches/org.mozilla.firefox",
+          "~/Library/Preferences/org.mozilla.crashreporter.plist",
+          "~/Library/Preferences/org.mozilla.firefox.plist",
+          "~/Library/Saved Application State/org.mozilla.firefox.savedState",
+          "~/Library/WebKit/org.mozilla.firefox",
+        ],
+        rmdir: [
+          "~/Library/Application Support/Mozilla", #  May also contain non-Firefox data
+          "~/Library/Caches/Mozilla",
+          "~/Library/Caches/Mozilla/updates",
+          "~/Library/Caches/Mozilla/updates/Applications",
+        ]
+  end
diff --git a/Mozilla/Firefox-Mac.cask.recipe.yaml b/Mozilla/Firefox-Mac.cask.recipe.yaml
new file mode 100644
index 0000000..b68e80d
--- /dev/null
+++ b/Mozilla/Firefox-Mac.cask.recipe.yaml
@@ -0,0 +1,16 @@
+# https://download.mozilla.org/?product=firefox-latest-ssl&os=osx&lang=en-US
+---
+Description: Creates an install script for the latest version of Firefox
+Identifier: com.github.jgstew.cask.Firefox-Mac
+Input:
+  NAME: "Firefox"
+  product: firefox-latest-ssl
+  OS: osx
+  filename: Firefox.dmg
+MinimumVersion: "2.3"
+ParentRecipe: com.github.jgstew.download.Firefox-Mac
+Process:
+  - Processor: com.github.jgstew.SharedProcessors/ContentFromTemplate
+    Arguments:
+      template_file_path: "./Mozilla/Firefox-Mac.cask.rb"
+      content_file_pathname: "%RECIPE_CACHE_DIR%/firefox.rb"
diff --git a/Mozilla/Firefox-Mac.download.recipe.yaml b/Mozilla/Firefox-Mac.download.recipe.yaml
index 2338636..23d28a2 100644
--- a/Mozilla/Firefox-Mac.download.recipe.yaml
+++ b/Mozilla/Firefox-Mac.download.recipe.yaml
@@ -34,3 +34,11 @@ Process:
       datetime_parsed_name: SourceReleaseDate
 
   - Processor: com.github.jgstew.SharedProcessors/FileHasher
+
+  - Processor: com.github.jgstew.SharedProcessors/BigFixSetupTemplateDictionary
+
+  - Processor: com.github.jgstew.SharedProcessors/TemplateDictionaryAppend
+    Arguments:
+      dictionary_name: template_dictionary
+      append_key: file_sha256
+      append_value: "%filehasher_sha256%"