diff --git a/manifests/Mozilla/FirefoxESR/78.9.0esr.yaml b/manifests/Mozilla/FirefoxESR/78.9.0esr.yaml
new file mode 100644
index 000000000..79584d5f5
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+++ b/manifests/Mozilla/FirefoxESR/78.9.0esr.yaml
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+Id: Mozilla.FirefoxESR
+Version: 78.9.0esr
+Name: Firefox ESR
+Publisher: Mozilla
+License: Mozilla Public License V2.0
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+AppMoniker: firefoxesr
+Tags: browser, firefox, mozilla, esr
+Description: Get unmatched data protection on the release cadence that suits you with Firefox for enterprise.
+Homepage: https://www.mozilla.org/en-US/firefox/enterprise/
+Installers:
+- Arch: x64
+  Url: https://download-installer.cdn.mozilla.net/pub/firefox/releases/78.9.0esr/win64/en-US/Firefox%20Setup%2078.9.0esr.msi
+  Sha256: D6C80E9323312D4EB36B6706D6DE6449ECC6298203D7452A54143D8407FEE47A
+  InstallerType: msi
+