--- a/devtools/client/accessibility/components/SimulationMenuButton.js
+++ b/devtools/client/accessibility/components/SimulationMenuButton.js
@@ -1,13 +1,15 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 "use strict";
 
+/* global gTelemetry */
+
 // React
 const {
   createFactory,
   Component,
 } = require("devtools/client/shared/vendor/react");
 const {
   hr,
   span,
@@ -34,16 +36,18 @@ loader.lazyGetter(this, "MenuItem", func
   );
 });
 loader.lazyGetter(this, "MenuList", function() {
   return createFactory(
     require("devtools/client/shared/components/menu/MenuList")
   );
 });
 
+const TELEMETRY_SIMULATION_ACTIVATED =
+  "devtools.accessibility.simulation_activated";
 const SIMULATION_MENU_LABELS = {
   NONE: "accessibility.filter.none",
   [SIMULATION_TYPE.DEUTERANOMALY]: "accessibility.simulation.deuteranomaly",
   [SIMULATION_TYPE.PROTANOMALY]: "accessibility.simulation.protanomaly",
   [SIMULATION_TYPE.PROTANOPIA]: "accessibility.simulation.protanopia",
   [SIMULATION_TYPE.DEUTERANOPIA]: "accessibility.simulation.deuteranopia",
   [SIMULATION_TYPE.TRITANOPIA]: "accessibility.simulation.tritanopia",
   [SIMULATION_TYPE.TRITANOMALY]: "accessibility.simulation.tritanomaly",
@@ -70,21 +74,26 @@ class SimulationMenuButton extends Compo
     const { dispatch, simulator } = this.props;
 
     dispatch(actions.simulate(simulator));
   }
 
   toggleSimulation(simKey) {
     const { dispatch, simulation, simulator } = this.props;
 
-    if (simulation[simKey]) {
-      this.disableSimulation();
-    } else {
+    if (!simulation[simKey]) {
+      if (gTelemetry) {
+        gTelemetry.keyedScalarAdd(TELEMETRY_SIMULATION_ACTIVATED, simKey, 1);
+      }
+
       dispatch(actions.simulate(simulator, [simKey]));
+      return;
     }
+
+    this.disableSimulation();
   }
 
   render() {
     const { simulation } = this.props;
     const simulationMenuButtonId = "simulation-menu-button";
     const toolbarLabelID = "accessibility-simulation-label";
     const currSimulation = Object.entries(simulation).find(
       simEntry => simEntry[1]

--- a/toolkit/components/telemetry/Scalars.yaml
+++ b/toolkit/components/telemetry/Scalars.yaml
@@ -2086,16 +2086,38 @@ devtools.accessibility:
     release_channel_collection: opt-out
     products:
       - 'firefox'
       - 'fennec'
       - 'geckoview'
     record_in_processes:
       - 'main'
 
+  simulation_activated:
+    bug_numbers:
+      - 1567200
+    description: >
+      Number of times accessibility simulation was activated (with mouse or keyboard)
+      from the accessibility panel's toolbar. Keyed by the simulation type
+      (e.g. "DEUTERANOMALY").
+    expires: "74"
+    kind: uint
+    keyed: true
+    notification_emails:
+      - dev-developer-tools@lists.mozilla.org
+      - yzenevich@mozilla.com
+      - mislam@mozilla.com
+    release_channel_collection: opt-out
+    products:
+      - 'firefox'
+      - 'fennec'
+      - 'geckoview'
+    record_in_processes:
+      - 'main'
+
 devtools.application:
   opened_count:
     bug_numbers:
       - 1451734
     description: >
       Number of times the DevTools Application panel has been opened.
     expires: "66"
     kind: uint