--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -1992,16 +1992,22 @@ Toolbox.prototype = {
    * @returns {Promise} a promise that resolves once the tool has been
    *          closed.
    */
   closeSplitConsole: function() {
     this._splitConsole = false;
     Services.prefs.setBoolPref(SPLITCONSOLE_ENABLED_PREF, false);
     this._refreshConsoleDisplay();
     this.component.setIsSplitConsoleActive(false);
+
+    this._telemetry.recordEvent("devtools.main", "deactivate", "split_console", null, {
+      "host": this._getTelemetryHostString(),
+      "width": Math.ceil(this.win.outerWidth / 50) * 50
+    });
+
     this.emit("split-console");
 
     if (this._lastFocusedElement) {
       this._lastFocusedElement.focus();
     }
     return promise.resolve();
   },
 

--- a/devtools/client/responsive.html/manager.js
+++ b/devtools/client/responsive.html/manager.js
@@ -141,22 +141,30 @@ const ResponsiveUIManager = exports.Resp
    *          - `menu`:     Web Developer menu item
    *          - `shortcut`: Keyboard shortcut
    *        - `reason`: String detailing the specific cause for closing
    * @return Promise
    *         Resolved (with no value) when closing is complete.
    */
   async closeIfNeeded(window, tab, options = {}) {
     if (this.isActiveForTab(tab)) {
-      let ui = this.activeTabs.get(tab);
-      let destroyed = await ui.destroy(options);
+      const ui = this.activeTabs.get(tab);
+      const destroyed = await ui.destroy(options);
       if (!destroyed) {
         // Already in the process of destroying, abort.
         return;
       }
+
+      const hostType = Services.prefs.getStringPref("devtools.toolbox.host");
+      const t = this._telemetry;
+      t.recordEvent("devtools.main", "deactivate", "responsive_design", null, {
+        "host": hostType,
+        "width": Math.ceil(window.outerWidth / 50) * 50
+      });
+
       this.activeTabs.delete(tab);
 
       if (!this.isActiveForWindow(window)) {
         this.removeMenuCheckListenerFor(window);
       }
       this.emit("off", { tab });
       await this.setMenuCheckFor(tab, window);
     }

--- a/toolkit/components/telemetry/Events.yaml
+++ b/toolkit/components/telemetry/Events.yaml
@@ -223,8 +223,19 @@ devtools.main:
     notification_emails: ["dev-developer-tools@lists.mozilla.org", "hkirschner@mozilla.com"]
     record_in_processes: ["main"]
     description: User activates the responsive_design or split_console in the devtools toolbox.
     release_channel_collection: opt-out
     expiry_version: never
     extra_keys:
       host: "Toolbox host (positioning): bottom, side, window or other."
       width: Toolbox width rounded up to the nearest 50px.
+  deactivate:
+    objects: ["responsive_design", "split_console"]
+    bug_numbers: [1455275]
+    notification_emails: ["dev-developer-tools@lists.mozilla.org", "hkirschner@mozilla.com"]
+    record_in_processes: ["main"]
+    description: User deactivates the responsive_design or split_console in the devtools toolbox.
+    release_channel_collection: opt-out
+    expiry_version: never
+    extra_keys:
+      host: "Toolbox host (positioning): bottom, side, window or other."
+      width: Toolbox width rounded up to the nearest 50px.