--- a/devtools/client/framework/devtools-browser.js
+++ b/devtools/client/framework/devtools-browser.js
@@ -316,17 +316,17 @@ var gDevToolsBrowser = (exports.gDevTool
         // of DevTools. The preference here is used as part of an experiment to
         // disable the F12 shortcut by default.
         const isF12Disabled = Services.prefs.getBoolPref(
           DEVTOOLS_F12_DISABLED_PREF,
           false
         );
 
         if (isF12Disabled) {
-          toggleEnableDevToolsPopup(window.document);
+          toggleEnableDevToolsPopup(window.document, startTime);
         } else {
           await gDevToolsBrowser.toggleToolboxCommand(
             window.gBrowser,
             startTime
           );
         }
         break;
       case "browserToolbox":

--- a/devtools/client/framework/enable-devtools-popup.js
+++ b/devtools/client/framework/enable-devtools-popup.js
@@ -1,14 +1,22 @@
 /* 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";
 
+loader.lazyGetter(this, "telemetry", () => {
+  const Telemetry = require("devtools/client/shared/telemetry");
+  return new Telemetry();
+});
+
+// This session id will be initialized the first time the popup is displayed.
+let telemetrySessionId = null;
+
 /**
  * Helper dedicated to toggle a popup triggered by pressing F12 if DevTools have
  * never been opened by the user.
  *
  * This popup should be anchored below the main hamburger menu of Firefox,
  * which contains the Web Developer menu.
  *
  * This is part of the OFF12 experiment which tries to disable F12 by default to
@@ -23,11 +31,25 @@ exports.toggleEnableDevToolsPopup = func
   const anchor = doc
     .getElementById("PanelUI-menu-button")
     .querySelector(".toolbarbutton-icon");
 
   const isVisible = popup.state === "open";
   if (isVisible) {
     popup.hidePopup();
   } else {
+    if (!telemetrySessionId) {
+      telemetrySessionId = parseInt(telemetry.msSinceProcessStart(), 10);
+    }
     popup.openPopup(anchor, "bottomcenter topright");
+    telemetry.recordEvent("f12_popup_displayed", "tools", null, {
+      session_id: telemetrySessionId,
+    });
   }
 };
+
+/**
+ * If a session id was already generated here for telemetry, expose it so that
+ * the toolbox can use it as its own session id.
+ */
+exports.getF12SessionId = function() {
+  return telemetrySessionId;
+};

--- a/devtools/client/framework/toolbox.js
+++ b/devtools/client/framework/toolbox.js
@@ -207,16 +207,23 @@ loader.lazyRequireGetter(
 );
 
 loader.lazyRequireGetter(
   this,
   "PICKER_TYPES",
   "devtools/shared/picker-constants"
 );
 
+loader.lazyRequireGetter(
+  this,
+  "getF12SessionId",
+  "devtools/client/framework/enable-devtools-popup",
+  true
+);
+
 const DEVTOOLS_F12_DISABLED_PREF = "devtools.experiment.f12.shortcut_disabled";
 
 /**
  * A "Toolbox" is the component that holds all the tools for one specific
  * target. Visually, it's a document that includes the tools tabs and all
  * the iframes where the tool panels will be living in.
  *
  * @param {object} target
@@ -252,16 +259,29 @@ function Toolbox(
 
   // The session ID is used to determine which telemetry events belong to which
   // toolbox session. Because we use Amplitude to analyse the telemetry data we
   // must use the time since the system wide epoch as the session ID.
   this.sessionId = msSinceProcessStart;
 
   // If the user opened the toolbox, we can now enable the F12 shortcut.
   if (Services.prefs.getBoolPref(DEVTOOLS_F12_DISABLED_PREF, false)) {
+    // If the toolbox is opening while F12 was disabled, the user might have
+    // pressed F12 and seen the "enable devtools" notification.
+    // A telemetry session_id was generated for the f12_popup_displayed event.
+    // Reuse it here in order to link the toolbox session to the
+    // f12_popup_displayed events.
+    // getF12SessionId() might return null if the popup was never displayed.
+    // In this case, fallback on the provided `msSinceProcessStart`.
+    this.sessionId = getF12SessionId() || msSinceProcessStart;
+
+    this.telemetry.recordEvent("f12_enabled", "tools", null, {
+      session_id: this.sessionId,
+    });
+
     // Flip the preference.
     Services.prefs.setBoolPref(DEVTOOLS_F12_DISABLED_PREF, false);
   }
 
   // Map of the available DevTools WebExtensions:
   //   Map<extensionUUID, extensionName>
   this._webExtensions = new Map();
 
@@ -1451,16 +1471,17 @@ Toolbox.prototype = {
 
     // Log current theme. The question we want to answer is:
     // "What proportion of users use which themes?"
     const currentTheme = Services.prefs.getCharPref("devtools.theme");
     this.telemetry.keyedScalarAdd(CURRENT_THEME_SCALAR, currentTheme, 1);
 
     const browserWin = this.topWindow;
     this.telemetry.preparePendingEvent(browserWin, "open", "tools", null, [
+      "enable_f12",
       "entrypoint",
       "first_panel",
       "host",
       "shortcut",
       "splitconsole",
       "width",
       "session_id",
     ]);

--- a/toolkit/components/telemetry/Events.yaml
+++ b/toolkit/components/telemetry/Events.yaml
@@ -1202,16 +1202,40 @@ devtools.main:
     expiry_version: never
     extra_keys:
       host: "Toolbox host (positioning): bottom, side, window or other."
       width: Toolbox width rounded up to the nearest 50px.
       next_panel: The name of the panel closed or other.
       panel_name: The name of the panel opened or other
       reason: debuggerStatement, breakpoint, exception, tab_switch, toolbox_show, initial_panel, toggle_settings_off, toggle_settings_on, key_shortcut, select_next_key, select_prev_key, tool_unloaded, inspect_dom, toolbox_closed, unknown etc.
       session_id: The start time of the session in milliseconds since epoch (Unix Timestamp) e.g. 1396381378123.
+  f12_enabled:
+    objects: ["tools"]
+    bug_numbers: [1630228]
+    notification_emails: ["dev-developer-tools@lists.mozilla.org", "hkirschner@mozilla.com"]
+    products:
+      - "firefox"
+    record_in_processes: ["main"]
+    description: User opened DevTools for the first time, which enables the F12 shortcut.
+    release_channel_collection: opt-out
+    expiry_version: "80"
+    extra_keys:
+      session_id: The start time of the session in milliseconds since epoch (Unix Timestamp) e.g. 1396381378123.
+  f12_popup_displayed:
+    objects: ["tools"]
+    bug_numbers: [1630228]
+    notification_emails: ["dev-developer-tools@lists.mozilla.org", "hkirschner@mozilla.com"]
+    products:
+      - "firefox"
+    record_in_processes: ["main"]
+    description: User triggered the "enable devtools" notification after pressing F12.
+    release_channel_collection: opt-out
+    expiry_version: "80"
+    extra_keys:
+      session_id: The start time of the session in milliseconds since epoch (Unix Timestamp) e.g. 1396381378123.
   filters_changed:
     objects: ["netmonitor", "webconsole"]
     bug_numbers: [1463144, 1463095]
     notification_emails: ["dev-developer-tools@lists.mozilla.org", "hkirschner@mozilla.com"]
     products:
       - "firefox"
       - "fennec"
       - "geckoview"
@@ -1647,25 +1671,25 @@ security.ui.protections:
     products:
       - firefox
     extra_keys:
       category: The category of protections the user is in, standard, strict or custom.
 
 security.ui.app_menu:
   click:
     bug_numbers:
-      - 1603545 
+      - 1603545
       - 1616229
     description: >
       Privacy and Security click events on app menu.
     objects: [
       "open_full_report",
     ]
     expiry_version: "80"
-    record_in_processes: 
+    record_in_processes:
       - main
     release_channel_collection: opt-out
     notification_emails:
       - chsiang@mozilla.com
       - ewright@mozilla.com
       - seceng-telemetry@mozilla.com
     products:
       - firefox