diff --git a/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/Mozilla.FirefoxDeveloperEdition.installer.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/Mozilla.FirefoxDeveloperEdition.installer.yaml
new file mode 100644
index 000000000..32c6aac0f
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/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: 88.0b7
+Installers:
+- Architecture: x64
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b7/win64/en-US/Firefox%20Setup%2088.0b7.msi
+  InstallerSha256: 937082C5850EECF8D0A2EA438F5EFB2AEFA15E6E72F1A47F195A4139B1BD632D
+  InstallerType: msi
+- Architecture: x86
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b7/win32/en-US/Firefox%20Setup%2088.0b7.msi
+  InstallerSha256: E8503FC410796BF7AD97EC346E2CA57FCBD2E2176A815DD19BFAD7036EF2E673
+  InstallerType: msi
+- Architecture: arm64
+  InstallerUrl: https://download-installer.cdn.mozilla.net/pub/devedition/releases/88.0b7/win64-aarch64/en-US/Firefox%20Setup%2088.0b7.exe
+  InstallerSha256: 4F0536962334F82C5881254EBACCFA65F9CABD0FE6D04EE367A92D917AE5B991
+  InstallerType: exe
+  InstallerSwitches:
+    Silent: /S
+    SilentWithProgress: /S
+ManifestType: installer
+ManifestVersion: 1.0.0
+
diff --git a/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/Mozilla.FirefoxDeveloperEdition.locale.en-US.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/Mozilla.FirefoxDeveloperEdition.locale.en-US.yaml
new file mode 100644
index 000000000..319367a2b
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/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: 88.0b7
+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/88.0b7/Mozilla.FirefoxDeveloperEdition.yaml b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/Mozilla.FirefoxDeveloperEdition.yaml
new file mode 100644
index 000000000..e359517cf
--- /dev/null
+++ b/manifests/m/Mozilla/FirefoxDeveloperEdition/88.0b7/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: 88.0b7
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.0.0
+