--- a/mobile/android/chrome/content/aboutLogins.js
+++ b/mobile/android/chrome/content/aboutLogins.js
@@ -2,16 +2,17 @@
 * 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/. */
 
 let Ci = Components.interfaces, Cc = Components.classes, Cu = Components.utils;
 
 Cu.import("resource://gre/modules/Messaging.jsm");
 Cu.import("resource://gre/modules/Services.jsm")
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/TelemetryStopwatch.jsm");
 
 XPCOMUtils.defineLazyGetter(window, "gChromeWin", function()
   window.QueryInterface(Ci.nsIInterfaceRequestor)
     .getInterface(Ci.nsIWebNavigation)
     .QueryInterface(Ci.nsIDocShellTreeItem)
     .rootTreeItem
     .QueryInterface(Ci.nsIInterfaceRequestor)
     .getInterface(Ci.nsIDOMWindow)
@@ -48,17 +49,19 @@ let Logins = {
     let contentBody = document.getElementById("content-body");
     let emptyBody = document.getElementById("empty-body");
     let filterIcon = document.getElementById("filter-button");
 
     this._toggleListBody(true);
     emptyBody.classList.add("hidden");
 
     try {
+      TelemetryStopwatch.start("PWMGR_ABOUT_LOGINS_GET_ALL_LOGINS_MS");
       logins = Services.logins.getAllLogins();
+      TelemetryStopwatch.finish("PWMGR_ABOUT_LOGINS_GET_ALL_LOGINS_MS");
     } catch(e) {
       // Master password was not entered
       debug("Master password permissions error: " + e);
       logins = [];
     }
     this._toggleListBody(false);
 
     if (!logins.length) {

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -8218,16 +8218,24 @@
     "alert_emails": ["firefox-dev@mozilla.org", "gavin@mozilla.com"],
     "expires_in_version": "50",
     "kind": "exponential",
     "high": "30000",
     "n_buckets": 20,
     "extended_statistics_ok": true,
     "description": "Sanitize: Time it takes to sanitize the open windows list (ms)"
   },
+  "PWMGR_ABOUT_LOGINS_GET_ALL_LOGINS_MS": {
+    "expires_in_version": "55",
+    "kind": "exponential",
+    "high": 60000,
+    "n_buckets": 30,
+    "extended_statistics_ok": true,
+    "description": "How long getAllLogins() on about:logins takes for mobile users"
+  },
   "PWMGR_BLOCKLIST_NUM_SITES": {
     "expires_in_version": "never",
     "kind": "exponential",
     "high": 100,
     "n_buckets" : 10,
     "extended_statistics_ok": true,
     "description": "The number of sites for which the user has explicitly rejected saving logins"
   },