--- a/devtools/client/canvasdebugger/canvasdebugger.js
+++ b/devtools/client/canvasdebugger/canvasdebugger.js
@@ -13,19 +13,16 @@ Cu.import("resource://gre/modules/Consol
 const { require } = Cu.import("resource://devtools/shared/Loader.jsm", {});
 const promise = require("promise");
 const Services = require("Services");
 const EventEmitter = require("devtools/shared/event-emitter");
 const { CallWatcherFront } = require("devtools/server/actors/call-watcher");
 const { CanvasFront } = require("devtools/server/actors/canvas");
 const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 
-const Telemetry = require("devtools/client/shared/telemetry");
-const telemetry = new Telemetry();
-
 const CANVAS_ACTOR_RECORDING_ATTEMPT = DevToolsUtils.testing ? 500 : 5000;
 
 XPCOMUtils.defineLazyModuleGetter(this, "Task",
   "resource://gre/modules/Task.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "PluralForm",
   "resource://gre/modules/PluralForm.jsm");
 
@@ -127,27 +124,25 @@ function shutdownCanvasDebugger() {
 /**
  * Functions handling target-related lifetime events.
  */
 var EventsHandler = {
   /**
    * Listen for events emitted by the current tab target.
    */
   initialize: function() {
-    telemetry.toolOpened("canvasdebugger");
     this._onTabNavigated = this._onTabNavigated.bind(this);
     gTarget.on("will-navigate", this._onTabNavigated);
     gTarget.on("navigate", this._onTabNavigated);
   },
 
   /**
    * Remove events emitted by the current tab target.
    */
   destroy: function() {
-    telemetry.toolClosed("canvasdebugger");
     gTarget.off("will-navigate", this._onTabNavigated);
     gTarget.off("navigate", this._onTabNavigated);
   },
 
   /**
    * Called for each location change in the debugged tab.
    */
   _onTabNavigated: function(event) {

--- a/devtools/client/memory/initializer.js
+++ b/devtools/client/memory/initializer.js
@@ -10,47 +10,43 @@ Cu.import("resource://devtools/client/sh
 const { require } = BrowserLoaderModule.BrowserLoader("resource://devtools/client/memory/", this);
 const { Task } = require("resource://gre/modules/Task.jsm");
 const { createFactory, createElement } = require("devtools/client/shared/vendor/react");
 const ReactDOM = require("devtools/client/shared/vendor/react-dom");
 const { Provider } = require("devtools/client/shared/vendor/react-redux");
 const App = createFactory(require("devtools/client/memory/app"));
 const Store = require("devtools/client/memory/store");
 const { assert } = require("devtools/shared/DevToolsUtils");
-const Telemetry = require("devtools/client/shared/telemetry");
 
 /**
  * The current target, toolbox, MemoryFront, and HeapAnalysesClient, set by this tool's host.
  */
 var gToolbox, gTarget, gFront, gHeapAnalysesClient;
 
 /**
  * Variables set by `initialize()`
  */
 var gStore, gRoot, gApp, gProvider, unsubscribe, isHighlighted, telemetry;
 
 var initialize = Task.async(function*() {
-  telemetry = new Telemetry();
-  telemetry.toolOpened("memory");
   gRoot = document.querySelector("#app");
   gStore = Store();
   gApp = createElement(App, { toolbox: gToolbox, front: gFront, heapWorker: gHeapAnalysesClient });
   gProvider = createElement(Provider, { store: gStore }, gApp);
   ReactDOM.render(gProvider, gRoot);
   unsubscribe = gStore.subscribe(onStateChange);
 });
 
 var destroy = Task.async(function*() {
   const ok = ReactDOM.unmountComponentAtNode(gRoot);
   assert(ok, "Should successfully unmount the memory tool's top level React component");
 
-  telemetry.toolClosed("memory");
   unsubscribe();
 
-  gStore, gRoot, gApp, gProvider, unsubscribe, isHighlighted, telemetry = null;
+  gStore, gRoot, gApp, gProvider, unsubscribe, isHighlighted;
 });
 
 /**
  * Fired on any state change, currently only handles toggling
  * the highlighting of the tool when recording allocations.
  */
 function onStateChange () {
   let isRecording = gStore.getState().allocations.recording;

--- a/devtools/client/scratchpad/scratchpad.js
+++ b/devtools/client/scratchpad/scratchpad.js
@@ -40,17 +40,16 @@ const EDITOR_FONT_SIZE = "devtools.scrat
 const ENABLE_AUTOCOMPLETION = "devtools.scratchpad.enableAutocompletion";
 const TAB_SIZE = "devtools.editor.tabsize";
 const FALLBACK_CHARSET_LIST = "intl.fallbackCharsetList.ISO-8859-1";
 
 const VARIABLES_VIEW_URL = "chrome://devtools/content/shared/widgets/VariablesView.xul";
 
 const {require, loader} = Cu.import("resource://devtools/shared/Loader.jsm", {});
 
-const Telemetry = require("devtools/client/shared/telemetry");
 const Editor    = require("devtools/client/sourceeditor/editor");
 const TargetFactory = require("devtools/client/framework/target").TargetFactory;
 const EventEmitter = require("devtools/shared/event-emitter");
 const {DevToolsWorker} = require("devtools/shared/worker/worker");
 const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 const promise = require("promise");
 const Services = require("Services");
 const {gDevTools} = require("devtools/client/framework/devtools");
@@ -87,21 +86,16 @@ XPCOMUtils.defineLazyGetter(this, "REMOT
   Services.prefs.getIntPref("devtools.debugger.remote-timeout"));
 
 XPCOMUtils.defineLazyModuleGetter(this, "ShortcutUtils",
   "resource://gre/modules/ShortcutUtils.jsm");
 
 XPCOMUtils.defineLazyModuleGetter(this, "Reflect",
   "resource://gre/modules/reflect.jsm");
 
-// Because we have no constructor / destructor where we can log metrics we need
-// to do so here.
-var telemetry = new Telemetry();
-telemetry.toolOpened("scratchpad");
-
 var WebConsoleUtils = require("devtools/shared/webconsole/utils").Utils;
 
 /**
  * The scratchpad object handles the Scratchpad window functionality.
  */
 var Scratchpad = {
   _instanceId: null,
   _initialWindowTitle: document.title,
@@ -1918,17 +1912,16 @@ var Scratchpad = {
 
     this.promptSave((aShouldClose, aSaved, aStatus) => {
        shouldClose = aShouldClose;
       if (aSaved && !Components.isSuccessCode(aStatus)) {
         shouldClose = false;
       }
 
       if (shouldClose) {
-        telemetry.toolClosed("scratchpad");
         window.close();
       }
 
       if (aCallback) {
         aCallback(shouldClose);
       }
     });
 

--- a/devtools/client/shadereditor/shadereditor.js
+++ b/devtools/client/shadereditor/shadereditor.js
@@ -12,18 +12,16 @@ Cu.import("resource://devtools/client/sh
 Cu.import("resource://gre/modules/Console.jsm");
 
 const {require} = Cu.import("resource://devtools/shared/Loader.jsm", {});
 const promise = require("promise");
 const Services = require("Services");
 const EventEmitter = require("devtools/shared/event-emitter");
 const {Tooltip} = require("devtools/client/shared/widgets/Tooltip");
 const Editor = require("devtools/client/sourceeditor/editor");
-const Telemetry = require("devtools/client/shared/telemetry");
-const telemetry = new Telemetry();
 
 // The panel's window global is an EventEmitter firing the following events:
 const EVENTS = {
   // When new programs are received from the server.
   NEW_PROGRAM: "ShaderEditor:NewProgram",
   PROGRAMS_ADDED: "ShaderEditor:ProgramsAdded",
 
   // When the vertex and fragment sources were shown in the editor.
@@ -82,34 +80,32 @@ function shutdownShaderEditor() {
 /**
  * Functions handling target-related lifetime events.
  */
 var EventsHandler = {
   /**
    * Listen for events emitted by the current tab target.
    */
   initialize: function() {
-    telemetry.toolOpened("shadereditor");
     this._onHostChanged = this._onHostChanged.bind(this);
     this._onTabNavigated = this._onTabNavigated.bind(this);
     this._onProgramLinked = this._onProgramLinked.bind(this);
     this._onProgramsAdded = this._onProgramsAdded.bind(this);
     gToolbox.on("host-changed", this._onHostChanged);
     gTarget.on("will-navigate", this._onTabNavigated);
     gTarget.on("navigate", this._onTabNavigated);
     gFront.on("program-linked", this._onProgramLinked);
     this.reloadButton = $("#requests-menu-reload-notice-button");
     this.reloadButton.addEventListener("command", this._onReloadCommand);
   },
 
   /**
    * Remove events emitted by the current tab target.
    */
   destroy: function() {
-    telemetry.toolClosed("shadereditor");
     gToolbox.off("host-changed", this._onHostChanged);
     gTarget.off("will-navigate", this._onTabNavigated);
     gTarget.off("navigate", this._onTabNavigated);
     gFront.off("program-linked", this._onProgramLinked);
     this.reloadButton.removeEventListener("command", this._onReloadCommand);
   },
 
   /**

--- a/devtools/client/storage/ui.js
+++ b/devtools/client/storage/ui.js
@@ -12,18 +12,16 @@ loader.lazyRequireGetter(this, "TreeWidg
                          "devtools/client/shared/widgets/TreeWidget", true);
 loader.lazyRequireGetter(this, "TableWidget",
                          "devtools/client/shared/widgets/TableWidget", true);
 loader.lazyImporter(this, "ViewHelpers",
   "resource://devtools/client/shared/widgets/ViewHelpers.jsm");
 loader.lazyImporter(this, "VariablesView",
   "resource://devtools/client/shared/widgets/VariablesView.jsm");
 
-const Telemetry = require("devtools/client/shared/telemetry");
-
 /**
  * Localization convenience methods.
  */
 const STORAGE_STRINGS = "chrome://devtools/locale/storage.properties";
 const L10N = new ViewHelpers.L10N(STORAGE_STRINGS);
 
 const GENERIC_VARIABLES_VIEW_SETTINGS = {
   lazyEmpty: true,
@@ -91,19 +89,16 @@ var StorageUI = this.StorageUI = functio
 
   this.onUpdate = this.onUpdate.bind(this);
   this.front.on("stores-update", this.onUpdate);
   this.onCleared = this.onCleared.bind(this);
   this.front.on("stores-cleared", this.onCleared);
 
   this.handleKeypress = this.handleKeypress.bind(this);
   this._panelDoc.addEventListener("keypress", this.handleKeypress);
-
-  this._telemetry = new Telemetry();
-  this._telemetry.toolOpened("storage");
 };
 
 exports.StorageUI = StorageUI;
 
 StorageUI.prototype = {
 
   storageTypes: null,
   shouldResetColumns: true,
@@ -114,17 +109,16 @@ StorageUI.prototype = {
   },
 
   destroy: function() {
     this.front.off("stores-update", this.onUpdate);
     this.front.off("stores-cleared", this.onCleared);
     this._panelDoc.removeEventListener("keypress", this.handleKeypress);
     this.searchBox.removeEventListener("input", this.filterItems);
     this.searchBox = null;
-    this._telemetry.toolClosed("storage");
   },
 
   /**
    * Empties and hides the object viewer sidebar
    */
   hideSidebar: function() {
     this.view.empty();
     this.sidebar.hidden = true;

--- a/devtools/client/webaudioeditor/controller.js
+++ b/devtools/client/webaudioeditor/controller.js
@@ -37,17 +37,16 @@ function shutdownWebAudioEditor() {
 /**
  * Functions handling target-related lifetime events.
  */
 var WebAudioEditorController = {
   /**
    * Listen for events emitted by the current tab target.
    */
   initialize: Task.async(function* () {
-    telemetry.toolOpened("webaudioeditor");
     this._onTabNavigated = this._onTabNavigated.bind(this);
     this._onThemeChange = this._onThemeChange.bind(this);
 
     gTarget.on("will-navigate", this._onTabNavigated);
     gTarget.on("navigate", this._onTabNavigated);
     gFront.on("start-context", this._onStartContext);
     gFront.on("create-node", this._onCreateNode);
     gFront.on("connect-node", this._onConnectNode);
@@ -71,17 +70,16 @@ var WebAudioEditorController = {
       AUDIO_NODE_DEFINITION = require("devtools/server/actors/utils/audionodes.json");
     }
   }),
 
   /**
    * Remove events emitted by the current tab target.
    */
   destroy: function() {
-    telemetry.toolClosed("webaudioeditor");
     gTarget.off("will-navigate", this._onTabNavigated);
     gTarget.off("navigate", this._onTabNavigated);
     gFront.off("start-context", this._onStartContext);
     gFront.off("create-node", this._onCreateNode);
     gFront.off("connect-node", this._onConnectNode);
     gFront.off("connect-param", this._onConnectParam);
     gFront.off("disconnect-node", this._onDisconnectNode);
     gFront.off("change-param", this._onChangeParam);

--- a/devtools/client/webaudioeditor/includes.js
+++ b/devtools/client/webaudioeditor/includes.js
@@ -13,18 +13,16 @@ const { loader, require } = Cu.import("r
 var { console } = Cu.import("resource://gre/modules/Console.jsm", {});
 var { EventTarget } = require("sdk/event/target");
 
 const { Task } = Cu.import("resource://gre/modules/Task.jsm", {});
 const { Class } = require("sdk/core/heritage");
 const EventEmitter = require("devtools/shared/event-emitter");
 const STRINGS_URI = "chrome://devtools/locale/webaudioeditor.properties"
 const L10N = new ViewHelpers.L10N(STRINGS_URI);
-const Telemetry = require("devtools/client/shared/telemetry");
-const telemetry = new Telemetry();
 const DevToolsUtils = require("devtools/shared/DevToolsUtils");
 const Services = require("Services");
 const { gDevTools } = require("devtools/client/framework/devtools");
 
 loader.lazyRequireGetter(this, "LineGraphWidget",
   "devtools/client/shared/widgets/LineGraphWidget");
 
 // `AUDIO_NODE_DEFINITION` defined in the controller's initialization,

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -6909,17 +6909,17 @@
     "description": "Number of times the DevTools Tilt has been opened via the toolbox button.",
     "releaseChannelCollection": "opt-out"
   },
   "DEVTOOLS_SCRATCHPAD_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 Scratchpad has been opened.",
+    "description": "Number of times the DevTools Scratchpad toolbox panel has been opened.",
     "releaseChannelCollection": "opt-out"
   },
   "DEVTOOLS_SCRATCHPAD_WINDOW_OPENED_COUNT": {
     "alert_emails": ["dev-developer-tools@lists.mozilla.org"],
     "expires_in_version": "never",
     "kind": "count",
     "bug_numbers": [1214352, 1247985],
     "description": "Number of times the DevTools Scratchpad standalone window has been opened.",