diff --git a/dom/quota/ActorsParent.cpp b/dom/quota/ActorsParent.cpp
index 0a9335376264..550e54f59797 100644
--- a/dom/quota/ActorsParent.cpp
+++ b/dom/quota/ActorsParent.cpp
@@ -4463,6 +4463,9 @@ nsresult QuotaManager::LoadQuota() {
   }
 
   const auto now = TimeStamp::Now();
+  Telemetry::ScalarSetMaximum(
+      Telemetry::ScalarID::QM_REPOSITORIES_INITIALIZATION_TIME,
+      static_cast<uint32_t>((now - startTime).ToMilliseconds()));
   Telemetry::AccumulateTimeDelta(
       Telemetry::QM_REPOSITORIES_INITIALIZATION_TIME_V2, startTime, now);
 
diff --git a/toolkit/components/telemetry/Scalars.yaml b/toolkit/components/telemetry/Scalars.yaml
index 629e4acccb14..c0f3af1d96ad 100644
--- a/toolkit/components/telemetry/Scalars.yaml
+++ b/toolkit/components/telemetry/Scalars.yaml
@@ -3248,6 +3248,25 @@ screenshots:
     record_in_processes:
       - 'main'
 
+# The following section is for quotaManager.
+qm:
+  repositories_initialization_time:
+    bug_numbers:
+      - 1609625
+    description: >
+      A temporary probe to track the time for initializing the best-effort
+      repositories especially the longest the time.
+    expires: "76"
+    kind: uint
+    notification_emails:
+      - ttung@mozilla.com
+      - storage-telemetry@mozilla.com
+    release_channel_collection: opt-out
+    products:
+      - 'firefox'
+    record_in_processes:
+      - 'main'
+
 # The following section is for tracking the number of failure for indexedDB.
 idb.failure:
   fileinfo_error: