--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -8225,16 +8225,25 @@
     "alert_emails": ["ajones@mozilla.com"],
     "expires_in_version": "55",
     "description": "Total time spent playing video in milliseconds. This reports the total play time for an HTML Media Element whenever it is suspended or resumed, such as when the page is unloaded, or when the mute status changes when the AudioChannelAPI pref is set.",
     "kind": "exponential",
     "high": 7200000,
     "n_buckets": 100,
     "bug_numbers": [1261955, 1127646]
   },
+  "VIDEO_HIDDEN_PLAY_TIME_MS" : {
+    "alert_emails": ["ajones@mozilla.com", "gsquelart@mozilla.com"],
+    "expires_in_version": "55",
+    "description": "Total time spent playing video while element is hidden, in milliseconds. This reports the total hidden play time for an HTML Media Element whenever it is suspended or resumed, such as when the page is unloaded, or when the mute status changes when the AudioChannelAPI pref is set.",
+    "kind": "exponential",
+    "high": 7200000,
+    "n_buckets": 100,
+    "bug_numbers": [1285419]
+  },
   "VIDEO_UNLOAD_STATE": {
     "alert_emails": ["ajones@mozilla.com"],
     "expires_in_version": "55",
     "kind": "enumerated",
     "n_values": 5,
     "description": "HTML Media Element state when unloading. ended = 0, paused = 1, stalled = 2, seeking = 3, other = 4",
     "bug_numbers": [1261955, 1261955]
   },