--- a/netwerk/dns/TRRService.cpp
+++ b/netwerk/dns/TRRService.cpp
@@ -568,26 +568,33 @@ TRRService::CompleteLookup(nsHostRecord 
       NS_NewTimerWithCallback(getter_AddRefs(mRetryConfirmTimer),
                               this, mRetryConfirmInterval,
                               nsITimer::TYPE_ONE_SHOT);
       if (mRetryConfirmInterval < 64000) {
         // double the interval up to this point
         mRetryConfirmInterval *= 2;
       }
     } else {
+      if (mMode != MODE_TRRONLY) {
+        // don't accumulate trronly data here since trronly failures are
+        // handled above by trying again, so counting the successes here would
+        // skew the numbers
+        Telemetry::Accumulate(Telemetry::DNS_TRR_NS_VERFIFIED,
+                              (mConfirmationState == CONFIRM_OK));
+      }
       mRetryConfirmInterval = 1000;
     }
     return LOOKUP_OK;
   }
 
   // when called without a host record, this is a domain name check response.
   if (NS_SUCCEEDED(status)) {
     LOG(("TRR verified %s to be fine!\n", newRRSet->mHostName));
   } else {
-    LOG(("TRR says %s doesn't resove as NS!\n", newRRSet->mHostName));
+    LOG(("TRR says %s doesn't resolve as NS!\n", newRRSet->mHostName));
     TRRBlacklist(nsCString(newRRSet->mHostName), pb, false);
   }
   return LOOKUP_OK;
 }
 
 #undef LOG
 
 } // namespace net

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -3284,16 +3284,24 @@
   "DNS_TRR_BLACKLISTED": {
     "record_in_processes": ["main"],
     "expires_in_version": "never",
     "kind": "boolean",
     "description": "DNS check for TRR was blocked by blacklist",
     "bug_numbers": [1434852],
     "alert_emails": ["necko@mozilla.com", "dstenberg@mozilla.com"]
   },
+  "DNS_TRR_NS_VERFIFIED": {
+    "record_in_processes": ["main"],
+    "expires_in_version": "never",
+    "kind": "boolean",
+    "description": "TRR managed to verify NS entry",
+    "bug_numbers": [1453825],
+    "alert_emails": ["necko@mozilla.com", "dstenberg@mozilla.com"]
+  },
   "DNS_LOOKUP_ALGORITHM": {
     "record_in_processes": ["main"],
     "alert_emails": ["necko@mozilla.com", "dstenberg@mozilla.com"],
     "expires_in_version": "never",
     "kind": "categorical",
     "labels": ["nativeOnly", "trrRace", "trrFirst", "trrOnly", "trrShadow"],
     "bug_numbers": [1434852],
     "description": "DNS: lookup algorithm"