diff --git a/netwerk/protocol/http/nsHttpChannel.cpp b/netwerk/protocol/http/nsHttpChannel.cpp
index 2d7de5a76fd6..2c884abab6e3 100644
--- a/netwerk/protocol/http/nsHttpChannel.cpp
+++ b/netwerk/protocol/http/nsHttpChannel.cpp
@@ -7360,10 +7360,6 @@ nsHttpChannel::OnStartRequest(nsIRequest* request) {
   Telemetry::Accumulate(Telemetry::HTTP_CHANNEL_ONSTART_SUCCESS,
                         NS_SUCCEEDED(mStatus));
 
-  nsAutoCString key = (mTransaction->IsHttp3Used()) ? "http3"_ns : "no_http3"_ns;
-  Telemetry::Accumulate(Telemetry::HTTP3_CHANNEL_ONSTART_SUCCESS, key,
-                        NS_SUCCEEDED(mStatus));
-
   if (gTRRService && gTRRService->IsConfirmed()) {
     Telemetry::Accumulate(Telemetry::HTTP_CHANNEL_ONSTART_SUCCESS_TRR,
                           TRRService::AutoDetectedKey(), NS_SUCCEEDED(mStatus));
diff --git a/toolkit/components/telemetry/Histograms.json b/toolkit/components/telemetry/Histograms.json
index 9e51c986510f..019319a5388b 100644
--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -3438,17 +3438,6 @@
     "bug_numbers": [1655566],
     "description": "HTTP3: number of times when a stream is blocked by the flow control while sendnig data."
   },
-  "HTTP3_CHANNEL_ONSTART_SUCCESS" : {
-    "record_in_processes": ["main", "content"],
-    "products": ["firefox"],
-    "expires_in_version": "never",
-    "kind": "boolean",
-    "description": "Successfully started HTTP channels when HTTP3 is used",
-    "bug_numbers": [1677987],
-    "releaseChannelCollection": "opt-out",
-    "keyed": true,
-    "alert_emails": ["necko@mozilla.com", "ddamjanovic@mozilla.com"]
-  },
   "HTTP_CONTENT_ENCODING": {
     "record_in_processes": ["main", "content"],
     "products": ["firefox", "fennec"],