diff --git a/dom/ipc/PWindowGlobal.ipdl b/dom/ipc/PWindowGlobal.ipdl
index d396c451d792..3ce59fbc5750 100644
--- a/dom/ipc/PWindowGlobal.ipdl
+++ b/dom/ipc/PWindowGlobal.ipdl
@@ -76,9 +76,9 @@ child:
                      uint32_t aFlags) returns (PaintFragment retval);
 
   /**
-   * Returns the serialized security info associated with this window.
+   * Returns the security info associated with this window.
    */
-  async GetSecurityInfo() returns(nsCString? serializedSecInfo);
+  async GetSecurityInfo() returns(nsITransportSecurityInfo securityInfo);
 
   async DispatchSecurityPolicyViolation(nsString aViolationEventJSON);
 
diff --git a/dom/ipc/WindowGlobalChild.cpp b/dom/ipc/WindowGlobalChild.cpp
index cfd03acd6ec8..895ebe4a215b 100644
--- a/dom/ipc/WindowGlobalChild.cpp
+++ b/dom/ipc/WindowGlobalChild.cpp
@@ -444,31 +444,31 @@ mozilla::ipc::IPCResult WindowGlobalChild::RecvDrawSnapshot(
 
 mozilla::ipc::IPCResult WindowGlobalChild::RecvGetSecurityInfo(
     GetSecurityInfoResolver&& aResolve) {
-  Maybe<nsCString> result;
+  nsCOMPtr<nsITransportSecurityInfo> securityInfo;
+  auto callResolve =
+      MakeScopeExit([aResolve, &securityInfo]() { aResolve(securityInfo); });
 
-  if (nsCOMPtr<Document> doc = mWindowGlobal->GetDoc()) {
-    nsCOMPtr<nsISupports> secInfo;
-    nsresult rv = NS_OK;
-
-    // First check if there's a failed channel, in case of a certificate
-    // error.
-    if (nsIChannel* failedChannel = doc->GetFailedChannel()) {
-      rv = failedChannel->GetSecurityInfo(getter_AddRefs(secInfo));
-    } else {
-      // When there's no failed channel we should have a regular
-      // security info on the document. In some cases there's no
-      // security info at all, i.e. on HTTP sites.
-      secInfo = doc->GetSecurityInfo();
-    }
-
-    if (NS_SUCCEEDED(rv) && secInfo) {
-      nsCOMPtr<nsISerializable> secInfoSer = do_QueryInterface(secInfo);
-      result.emplace();
-      NS_SerializeToString(secInfoSer, result.ref());
-    }
+  nsCOMPtr<Document> doc = mWindowGlobal->GetDoc();
+  if (!doc) {
+    return IPC_OK();
   }
 
-  aResolve(result);
+  nsCOMPtr<nsISupports> securityInfoSupports;
+  // First check if there's a failed channel, in case of a certificate
+  // error.
+  if (nsIChannel* failedChannel = doc->GetFailedChannel()) {
+    nsresult rv =
+        failedChannel->GetSecurityInfo(getter_AddRefs(securityInfoSupports));
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return IPC_OK();
+    }
+  } else {
+    // When there's no failed channel we should have a regular
+    // security info on the document. In some cases there's no
+    // security info at all, i.e. on HTTP sites.
+    securityInfoSupports = doc->GetSecurityInfo();
+  }
+  securityInfo = do_QueryInterface(securityInfoSupports);
   return IPC_OK();
 }
 
diff --git a/dom/ipc/WindowGlobalParent.cpp b/dom/ipc/WindowGlobalParent.cpp
index 5ed5e49939ce..817b307305e0 100644
--- a/dom/ipc/WindowGlobalParent.cpp
+++ b/dom/ipc/WindowGlobalParent.cpp
@@ -987,19 +987,9 @@ already_AddRefed<Promise> WindowGlobalParent::GetSecurityInfo(
   }
 
   SendGetSecurityInfo(
-      [promise](Maybe<nsCString>&& aResult) {
-        if (aResult) {
-          nsCOMPtr<nsISupports> infoObj;
-          nsresult rv =
-              NS_DeserializeObject(aResult.value(), getter_AddRefs(infoObj));
-          if (NS_WARN_IF(NS_FAILED(rv))) {
-            promise->MaybeReject(NS_ERROR_FAILURE);
-          }
-          nsCOMPtr<nsITransportSecurityInfo> info = do_QueryInterface(infoObj);
-          if (!info) {
-            promise->MaybeReject(NS_ERROR_FAILURE);
-          }
-          promise->MaybeResolve(info);
+      [promise](const nsCOMPtr<nsITransportSecurityInfo>& aSecurityInfo) {
+        if (aSecurityInfo) {
+          promise->MaybeResolve(aSecurityInfo);
         } else {
           promise->MaybeResolveWithUndefined();
         }