Added Mozilla Thunderbird version 78.7.0. (#6631)

manifests/Mozilla/Thunderbird/78.7.0.yaml

@@ -0,0 +1,18 @@
+Id: Mozilla.Thunderbird
+Version: 78.7.0
+Name: Thunderbird
+Publisher: Mozilla
+AppMoniker: thunderbird
+Tags: thunderbird, email, eMail, E-mail, email Client
+Description: Thunderbird is a free email application that’s easy to set up and customize!
+Homepage: https://www.thunderbird.net
+License: Mozilla Public License Version 2.0
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+
+Installers:
+  - Arch: x64
+    Url: https://download-installer.cdn.mozilla.net/pub/thunderbird/releases/78.7.0/win64/en-US/Thunderbird%20Setup%2078.7.0.msi
+    Sha256: 9170AC75FAEC6F9C7C3AE33CE4D259B0244CA014EB17C0820A4F475CC5461336
+    InstallerType: msi
+    Language: en-US
+