--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -1,8 +1,9 @@
+1;4601;0c
 
 {
   "A11Y_INSTANTIATED_FLAG": {
     "expires_in_version": "never",
     "kind": "flag",
     "description": "has accessibility support been instantiated"
   },
   "A11Y_CONSUMERS": {
@@ -5202,17 +5203,17 @@
     "releaseChannelCollection": "opt-out",
     "description": "Count how often each preference category is opened."
   },
   "FX_PREFERENCES_OPENED_VIA": {
     "bug_numbers": [11330315],
     "alert_emails": ["jaws@mozilla.com"],
     "expires_in_version": "57",
     "kind": "categorical",
-    "labels": ["preferencesButton", "fxaSignedin", "fxaError", "aboutHome", "dataReporting", "offlineApps", "aboutTelemetry", "commandLine", "commandLineLegacy", "fxa", "browserMedia", "paneSearch"],
+    "labels": ["preferencesButton", "fxaSignedin", "fxaError", "aboutHome", "dataReporting", "offlineApps", "aboutTelemetry", "commandLine", "commandLineLegacy", "fxa", "browserMedia", "paneSearch", "paneContainers"],
     "releaseChannelCollection": "opt-out",
     "description":"Count how the Preferences are opened."
   },
   "INPUT_EVENT_RESPONSE_MS": {
     "alert_emails": ["perf-telemetry-alerts@mozilla.com"],
     "bug_numbers": [1235908],
     "expires_in_version": "never",
     "kind": "exponential",