diff --git a/toolkit/components/telemetry/docs/data/crash-ping.rst b/toolkit/components/telemetry/docs/data/crash-ping.rst
index f29ebfd2a530..bdbd0e733ccb 100644
--- a/toolkit/components/telemetry/docs/data/crash-ping.rst
+++ b/toolkit/components/telemetry/docs/data/crash-ping.rst
@@ -87,6 +87,7 @@ Structure:
           UptimeTS: <duration>, // Seconds since Firefox was started, this can have a fractional component
           User32BeforeBlocklist: "1", // Windows-only, present only if user32.dll was loaded before the DLL blocklist has been initialized
           WindowsErrorReporting: "1", // Windows-only, present only if the crash was intercepted by the WER runtime exception module
+          WindowsPackageFamilyName: <string>, // Windows-only, a string containing the "Package Family Name" of Firefox, if installed through an MSIX package
         },
         hasCrashEnvironment: bool
       }
@@ -244,3 +245,4 @@ Version History
 - Firefox 90: Removed MemoryErrorCorrection (`bug 1710152 <https://bugzilla.mozilla.org/show_bug.cgi?id=1710152>`_)
   and added WindowsErrorReporting (`bug 1703761 <https://bugzilla.mozilla.org/show_bug.cgi?id=1703761>`_).
 - Firefox 95: Added HeadlessMode and BackgroundTaskName (`bug 1697875 <https://bugzilla.mozilla.org/show_bug.cgi?id=1697875>`_)
+- Firefox 96: Added WindowsPackageFamilyName (`bug 1738375 <https://bugzilla.mozilla.org/show_bug.cgi?id=1738375>`_).
diff --git a/toolkit/crashreporter/CrashAnnotations.yaml b/toolkit/crashreporter/CrashAnnotations.yaml
index 8d91088545a7..74683f1a24ad 100644
--- a/toolkit/crashreporter/CrashAnnotations.yaml
+++ b/toolkit/crashreporter/CrashAnnotations.yaml
@@ -974,6 +974,15 @@ WasmLibrarySandboxMallocFailed:
     Set to 1 if a rlbox wasm library sandbox ran out of memory, causing a
     malloc inside the sandbox to fail.
   type: boolean
+
+WindowsPackageFamilyName:
+  description: >
+    If running in a Windows package context, the package family name, per
+    https://docs.microsoft.com/en-us/windows/win32/api/appmodel/nf-appmodel-getcurrentpackagefamilyname.
+
+    The package family name is only included when it is likely to have been produced by Mozilla: it
+    starts "Mozilla." or "MozillaCorporation.".
+  type: string
   ping: true
 
 WindowsErrorReporting:
diff --git a/toolkit/xre/nsAppRunner.cpp b/toolkit/xre/nsAppRunner.cpp
index 8c2c5e732cb1..3acf47e21029 100644
--- a/toolkit/xre/nsAppRunner.cpp
+++ b/toolkit/xre/nsAppRunner.cpp
@@ -3803,6 +3803,14 @@ int XREMain::XRE_mainInit(bool* aExitFlag) {
       CrashReporter::AnnotateCrashReport(CrashReporter::Annotation::AppInitDLLs,
                                          NS_ConvertUTF16toUTF8(appInitDLLs));
     }
+
+    nsString packageFamilyName = widget::WinUtils::GetPackageFamilyName();
+    if (StringBeginsWith(packageFamilyName, u"Mozilla."_ns) ||
+        StringBeginsWith(packageFamilyName, u"MozillaCorporation."_ns)) {
+      CrashReporter::AnnotateCrashReport(
+          CrashReporter::Annotation::WindowsPackageFamilyName,
+          NS_ConvertUTF16toUTF8(packageFamilyName));
+    }
 #endif
 
     bool isBackgroundTaskMode = false;