diff --git a/js/public/MemoryMetrics.h b/js/public/MemoryMetrics.h
index 49cabaa2028..81172f3747e 100644
--- a/js/public/MemoryMetrics.h
+++ b/js/public/MemoryMetrics.h
@@ -135,6 +135,7 @@ struct CompartmentStats
     size_t shapesCompartmentTables;
     size_t scriptData;
     size_t mjitData;
+    size_t crossCompartmentWrappers;
 
     TypeInferenceSizes typeInferenceSizes;
 };
diff --git a/js/src/MemoryMetrics.cpp b/js/src/MemoryMetrics.cpp
index 95207d327b3..46e0d990a73 100644
--- a/js/src/MemoryMetrics.cpp
+++ b/js/src/MemoryMetrics.cpp
@@ -69,6 +69,8 @@ StatsCompartmentCallback(JSRuntime *rt, void *data, JSCompartment *compartment)
     // Get the compartment-level numbers.
     compartment->sizeOfTypeInferenceData(&cStats.typeInferenceSizes, rtStats->mallocSizeOf);
     cStats.shapesCompartmentTables = compartment->sizeOfShapeTable(rtStats->mallocSizeOf);
+    cStats.crossCompartmentWrappers =
+        compartment->crossCompartmentWrappers.sizeOfExcludingThis(rtStats->mallocSizeOf);
 }
 
 static void
diff --git a/js/xpconnect/src/XPCJSRuntime.cpp b/js/xpconnect/src/XPCJSRuntime.cpp
index ec7c3acba6c..351b18f93de 100644
--- a/js/xpconnect/src/XPCJSRuntime.cpp
+++ b/js/xpconnect/src/XPCJSRuntime.cpp
@@ -1487,6 +1487,11 @@ ReportCompartmentStats(const JS::CompartmentStats &cStats,
                   "compilation data: JITScripts, native maps, and inline "
                   "cache structs.");
 
+    REPORT_BYTES0(MakePath(pathPrefix, cStats, "cross-compartment-wrappers"),
+                  nsIMemoryReporter::KIND_HEAP, cStats.crossCompartmentWrappers,
+                  "Memory used by the compartment's cross-compartment "
+                  "wrappers.");
+
     REPORT_BYTES0(MakePath(pathPrefix, cStats, "type-inference/script-main"),
                   nsIMemoryReporter::KIND_HEAP,
                   cStats.typeInferenceSizes.scripts,