diff --git a/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.installer.yaml b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.installer.yaml
new file mode 100644
index 000000000..f398b27b3
--- /dev/null
+++ b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.installer.yaml
@@ -0,0 +1,38 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.1.0.0.schema.json
+PackageIdentifier: Mozilla.Firefox
+PackageVersion: "77.0"
+FileExtensions:
+- html
+- htm
+- url
+Protocols:
+- http
+- https
+Commands:
+- firefox
+MinimumOSVersion: 10.0.0.0
+Installers:
+- Architecture: x64
+  InstallerType: msi
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/77.0/win64/en-US/Firefox%20Setup%2077.0.msi
+  InstallerSha256: 60D3DA66D53A8882055C7EC1B38EF862A8022E23A18BCFBA443E19122A5D581C
+  Scope: machine
+  InstallerLocale: en-US
+- Architecture: x86
+  InstallerType: msi
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/77.0/win32/en-US/Firefox%20Setup%2077.0.msi
+  InstallerSha256: AC821B26DEACFC2AE4B2F3A88BAA84934E61C3AB0D9B54853F83C3FA5ECDD230
+  Scope: machine
+  InstallerLocale: en-US
+- Architecture: arm64
+  InstallerType: exe
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/77.0/win64-aarch64/en-US/Firefox%20Setup%2077.0.exe
+  InstallerSha256: 817C0597146135B3E4D8A94DA4F85F1221CF04FA5D9DBF6F27FDB66FCF43A524
+  Scope: machine
+  InstallerLocale: en-US
+  InstallerSwitches:
+    Silent: /S
+    SilentWithProgress: /S
+ManifestType: installer
+ManifestVersion: 1.0.0
+
diff --git a/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.locale.en-US.yaml b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.locale.en-US.yaml
new file mode 100644
index 000000000..5f2c0fb9a
--- /dev/null
+++ b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.locale.en-US.yaml
@@ -0,0 +1,19 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.defaultlocale.1.0.0.schema.json
+PackageIdentifier: Mozilla.Firefox
+PackageVersion: "77.0"
+PackageLocale: en-US
+Author: Mozilla
+Moniker: firefox
+Tags:
+- Browser
+- Mozilla
+- Firefox
+PackageUrl: https://www.mozilla.org/en-US/firefox/new/
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+Publisher: Mozilla
+PackageName: Firefox
+License: Mozilla Public License Version 2.0
+ShortDescription: Mozilla Firefox is free and open source software, built by a community of thousands from all over the world.
+ManifestType: defaultLocale
+ManifestVersion: 1.0.0
+
diff --git a/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.yaml b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.yaml
index bb66b165a..2b57e92c2 100644
--- a/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.yaml
+++ b/manifests/m/Mozilla/Firefox/77.0/Mozilla.Firefox.yaml
@@ -1,20 +1,7 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.1.0.0.schema.json
 PackageIdentifier: Mozilla.Firefox
-Publisher: Mozilla
-PackageName: Firefox
-ShortDescription: Mozilla Firefox is free and open source software, built by a community of thousands from all over the world.
-PackageUrl: https://www.mozilla.org/en-US/firefox/new/
-Tags:
-- Browser
-- Mozilla
-- Firefox
-License: Mozilla Public License Version 2.0
-LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
-PackageVersion: 77.0
-InstallerType: msi
-Installers:
-- Architecture: x64
-  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/77.0/win64/en-US/Firefox%20Setup%2077.0.msi
-  InstallerSha256: 60D3DA66D53A8882055C7EC1B38EF862A8022E23A18BCFBA443E19122A5D581C
-PackageLocale: en-US
-ManifestType: singleton
+PackageVersion: "77.0"
+DefaultLocale: en-US
+ManifestType: version
 ManifestVersion: 1.0.0
+