diff --git a/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.installer.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.installer.yaml
new file mode 100644
index 000000000..287517e80
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.installer.yaml
@@ -0,0 +1,22 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.installer.1.0.0.schema.json
+PackageIdentifier: Mozilla.FirefoxDeveloperEdition
+PackageVersion: 88.0b8
+Installers:
+- Architecture: x64
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b8/win64/en-US/Firefox%20Setup%2088.0b8.msi
+  InstallerSha256: 687FF6380D39A491BC53850293D03F0CA6F19BC252868B2EE8CF772540765CAA
+  InstallerType: msi
+- Architecture: x86
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b8/win32/en-US/Firefox%20Setup%2088.0b8.msi
+  InstallerSha256: DE00038F15607456AF49957743FB16123C287CF38CE20720BC75CEAD317DE170
+  InstallerType: msi
+- Architecture: arm64
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b8/win64-aarch64/en-US/Firefox%20Setup%2088.0b8.exe
+  InstallerSha256: DE1C53C25F3B2399933490E388BA05C0CC41F7158592B7FACF97164179D7559F
+  InstallerType: exe
+  InstallerSwitches:
+    Silent: /S
+    SilentWithProgress: /S
+ManifestType: installer
+ManifestVersion: 1.0.0
+
diff --git a/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.locale.en-US.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.locale.en-US.yaml
new file mode 100644
index 000000000..38beafec6
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.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.FirefoxDeveloperEdition
+PackageVersion: 88.0b8
+PackageLocale: en-US
+LicenseUrl: https://www.mozilla.org/en-US/MPL/2.0/
+Moniker: firefoxdev
+Tags:
+- browser
+- mozilla
+- firefox
+- dev
+PackageUrl: https://www.mozilla.org/en-US/firefox/developer/
+Publisher: Mozilla
+PackageName: Firefox Developer Edition
+License: Mozilla Public License V2.0
+ShortDescription: Firefox Developer Edition is the blazing fast browser that offers cutting edge developer tools and latest features like CSS Grid support and framework debugging.
+ManifestType: defaultLocale
+ManifestVersion: 1.0.0
+
diff --git a/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.yaml
new file mode 100644
index 000000000..f5701b98b
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b8/Mozilla.FirefoxDeveloperEdition.yaml
@@ -0,0 +1,7 @@
+# yaml-language-server: $schema=https://aka.ms/winget-manifest.version.1.0.0.schema.json
+PackageIdentifier: Mozilla.FirefoxDeveloperEdition
+PackageVersion: 88.0b8
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.0.0
+