--- a/devtools/client/shared/telemetry.js
+++ b/devtools/client/shared/telemetry.js
@@ -92,16 +92,20 @@ Telemetry.prototype = {
     ruleview: {
       histogram: "DEVTOOLS_RULEVIEW_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_RULEVIEW_TIME_ACTIVE_SECONDS"
     },
     computedview: {
       histogram: "DEVTOOLS_COMPUTEDVIEW_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_COMPUTEDVIEW_TIME_ACTIVE_SECONDS"
     },
+    layoutview: {
+      histogram: "DEVTOOLS_LAYOUTVIEW_OPENED_COUNT",
+      timerHistogram: "DEVTOOLS_LAYOUTVIEW_TIME_ACTIVE_SECONDS"
+    },
     fontinspector: {
       histogram: "DEVTOOLS_FONTINSPECTOR_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_FONTINSPECTOR_TIME_ACTIVE_SECONDS"
     },
     animationinspector: {
       histogram: "DEVTOOLS_ANIMATIONINSPECTOR_OPENED_COUNT",
       timerHistogram: "DEVTOOLS_ANIMATIONINSPECTOR_TIME_ACTIVE_SECONDS"
     },

--- a/devtools/client/shared/test/browser_telemetry_sidebar.js
+++ b/devtools/client/shared/test/browser_telemetry_sidebar.js
@@ -24,17 +24,17 @@ add_task(function* () {
   yield gDevTools.closeToolbox(target);
   gBrowser.removeCurrentTab();
 });
 
 function* testSidebar(toolbox) {
   info("Testing sidebar");
 
   let inspector = toolbox.getCurrentPanel();
-  let sidebarTools = ["ruleview", "computedview", "fontinspector",
+  let sidebarTools = ["ruleview", "computedview", "layoutview", "fontinspector",
                       "animationinspector"];
 
   // Concatenate the array with itself so that we can open each tool twice.
   sidebarTools.push.apply(sidebarTools, sidebarTools);
 
   return new Promise(resolve => {
     // See TOOL_DELAY for why we need setTimeout here
     setTimeout(function selectSidebarTab() {

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -7740,16 +7740,24 @@
   "DEVTOOLS_COMPUTEDVIEW_OPENED_COUNT": {
     "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
     "expires_in_version": "never",
     "kind": "count",
     "bug_numbers": [1247985],
     "description": "Number of times the DevTools Computed View has been opened.",
     "releaseChannelCollection": "opt-out"
   },
+  "DEVTOOLS_LAYOUTVIEW_OPENED_COUNT": {
+    "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
+    "expires_in_version": "never",
+    "kind": "count",
+    "bug_numbers": [1347552],
+    "description": "Number of times the DevTools Layout View has been opened.",
+    "releaseChannelCollection": "opt-out"
+  },
   "DEVTOOLS_FONTINSPECTOR_OPENED_COUNT": {
     "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
     "expires_in_version": "never",
     "kind": "count",
     "bug_numbers": [1247985],
     "description": "Number of times the DevTools Font Inspector has been opened.",
     "releaseChannelCollection": "opt-out"
   },
@@ -8035,16 +8043,23 @@
   },
   "DEVTOOLS_COMPUTEDVIEW_TIME_ACTIVE_SECONDS": {
     "expires_in_version": "never",
     "kind": "exponential",
     "high": 10000000,
     "n_buckets": 100,
     "description": "How long has the computed view been active (seconds)"
   },
+  "DEVTOOLS_LAYOUTVIEW_TIME_ACTIVE_SECONDS": {
+    "expires_in_version": "never",
+    "kind": "exponential",
+    "high": 10000000,
+    "n_buckets": 100,
+    "description": "How long has the layout view been active (seconds)"
+  },
   "DEVTOOLS_FONTINSPECTOR_TIME_ACTIVE_SECONDS": {
     "expires_in_version": "never",
     "kind": "exponential",
     "high": 10000000,
     "n_buckets": 100,
     "description": "How long has the font inspector been active (seconds)"
   },
   "DEVTOOLS_ANIMATIONINSPECTOR_TIME_ACTIVE_SECONDS": {