diff --git a/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.installer.yaml b/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.installer.yaml
index aa1b2f15f..c2273f8fc 100644
--- a/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.installer.yaml
+++ b/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.installer.yaml
@@ -33,6 +33,26 @@ Installers:
   InstallerSwitches:
     Silent: /S
     SilentWithProgress: /S
+
+- Architecture: x64
+  InstallerType: msi
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/78.0.2/win64/cs/Firefox%20Setup%2078.0.2.msi
+  InstallerSha256: 2882311af77db31fb784cb3bc0eb976be6bdd052a4eb72a41b6694c650933830
+  Scope: machine
+  InstallerLocale: cs
+- Architecture: x86
+  InstallerType: msi
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/78.0.2/win32/cs/Firefox%20Setup%2078.0.2.msi
+  InstallerSha256: B5F5FD172D750552BEB8F32118D833ABD7C6FBC43F53FEE3A0135F047785D3DE
+  Scope: machine
+  InstallerLocale: cs
+- Architecture: arm64
+  InstallerType: msi
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/firefox/releases/78.0.2/win64-aarch64/cs/Firefox%20Setup%2078.0.2.exe
+  InstallerSha256: 3A29C678E846C9E934E4A32A96877AFE927E9677998684888EDB463E4560DC2C
+  Scope: machine
+  InstallerLocale: cs
+
 ManifestType: installer
 ManifestVersion: 1.0.0
 
diff --git a/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.locale.cs.yaml b/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.locale.cs.yaml
new file mode 100644
index 000000000..1dc25520c
--- /dev/null
+++ b/manifests/m/Mozilla/Firefox/78.0.2/Mozilla.Firefox.locale.cs.yaml
@@ -0,0 +1,26 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.locale.1.0.0.schema.json
+PackageIdentifier: Mozilla.Firefox
+PackageVersion: 78.0.2
+PackageLocale: cs
+Publisher: Mozilla Foundation
+PublisherUrl: https://www.mozilla.org/cs/
+PublisherSupportUrl: https://support.mozilla.org/cs/
+PrivacyUrl: https://www.mozilla.org/cs/privacy/websites/
+Author: Mozilla Foundation
+PackageName: Firefox
+PackageUrl: https://www.mozilla.org/cs/
+License: Mozilla Public License Version 2.0
+LicenseUrl: https://www.mozilla.org/cs/MPL/2.0/
+#Copyright: 
+#CopyrightUrl: 
+ShortDescription: Mozilla Firefox czech
+#Description: 
+Tags:
+  - Browser
+  - Mozilla
+  - Gecko
+  - Quantum
+  - SpiderMonkey
+ManifestType: locale
+ManifestVersion: 1.0.0
+