--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -1139,16 +1139,54 @@ BrowserGlue.prototype = {
     }
 
     this._checkForOldBuildUpdates();
 
     if ("release" != AppConstants.MOZ_UPDATE_CHANNEL) {
       this.checkForPendingCrashReports();
     }
 
+    if (AppConstants.platform == "win") {
+      try {
+        Services.telemetry
+                .getHistogramById("STUB_INSTALLER_HIDE_DEFAULT_BROWSER_CHECKBOX")
+                .add(false);
+      } catch (ex) {}
+
+      let stubDefaultRequested =
+        WindowsRegistry.readRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
+                                   "Software\\Mozilla\\Firefox",
+                                   "DefaultBrowserRequested");
+      WindowsRegistry.removeRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
+                                   "Software\\Mozilla\\Firefox",
+                                   "DefaultBrowserRequested");
+      if (stubDefaultRequested) {
+        try {
+          Services.telemetry
+                  .getHistogramById("STUB_INSTALLER_SET_AS_DEFAULT_REQUESTED")
+                  .add(stubDefaultRequested);
+        } catch (ex) {}
+      }
+
+      let stubDefaultResult =
+        WindowsRegistry.readRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
+                                   "Software\\Mozilla\\Firefox",
+                                   "DefaultBrowserResult");
+      WindowsRegistry.removeRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
+                                   "Software\\Mozilla\\Firefox",
+                                   "DefaultBrowserResult");
+      if (stubDefaultResult) {
+        try {
+          Services.telemetry
+                  .getHistogramById("STUB_INSTALLER_SET_AS_DEFAULT_RESULT")
+                  .add(stubDefaultResult);
+        } catch (ex) {}
+      }
+    }
+
     this._firstWindowTelemetry(aWindow);
     this._firstWindowLoaded();
   },
 
   /**
    * Application shutdown handler.
    */
   _onQuitApplicationGranted: function () {

--- a/browser/installer/windows/nsis/stub.nsi
+++ b/browser/installer/windows/nsis/stub.nsi
@@ -765,24 +765,29 @@ Function SendPing
                       $\nExisting Profile = $ExistingProfile \
                       $\nExisting Version = $ExistingVersion \
                       $\nExisting Build ID = $ExistingBuildID \
                       $\nNew Version = $R5 \
                       $\nNew Build ID = $R6 \
                       $\nDefault Install Dir = $R7 \
                       $\nHas Admin = $R8 \
                       $\nDefault Status = $R2 \
-                      $\nSet As Sefault Status = $R3 \
+                      $\nSet As Default Status = $R3 \
                       $\nDownload Server IP = $DownloadServerIP \
                       $\nPost-Signing Data = $PostSigningData"
     ; The following will exit the installer
     SetAutoClose true
     StrCpy $R9 "2"
     Call RelativeGotoPage
 !else
+
+    WriteRegStr HKCU "Software\Mozilla\Firefox" "DefaultBrowserRequested" "$R3"
+    WriteRegStr HKCU "Software\Mozilla\Firefox" "DefaultBrowserResult" "$R2"
+    ClearErrors
+
     ${NSD_CreateTimer} OnPing ${DownloadIntervalMS}
     InetBgDL::Get "${BaseURLStubPing}/${StubURLVersion}${StubURLVersionAppend}/${Channel}/${UpdateChannel}/${AB_CD}/$R0/$R1/$5/$6/$7/$8/$9/$ExitCode/$FirefoxLaunchCode/$DownloadRetryCount/$DownloadedBytes/$DownloadSizeBytes/$IntroPhaseSeconds/$OptionsPhaseSeconds/$0/$1/$DownloadFirstTransferSeconds/$2/$3/$4/$InitialInstallRequirementsCode/$OpenedDownloadPage/$ExistingProfile/$ExistingVersion/$ExistingBuildID/$R5/$R6/$R7/$R8/$R2/$R3/$DownloadServerIP/$PostSigningData" \
                   "$PLUGINSDIR\_temp" /END
 !endif
   ${Else}
     ${If} "$IsDownloadFinished" == "false"
       ; Cancel the download in progress
       InetBgDL::Get /RESET /END

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -8113,16 +8113,36 @@
   "BROWSER_SET_DEFAULT_TIME_TO_COMPLETION_SECONDS": {
     "expires_in_version": "never",
     "kind": "exponential",
     "high": 500,
     "n_buckets": 15,
     "releaseChannelCollection": "opt-out",
     "description": "Time to successfully set Firefox as the default browser after clicking 'Set Firefox as Default'. Should be near-instant in some environments, others require user interaction. Measured in seconds."
   },
+  "STUB_INSTALLER_HIDE_DEFAULT_BROWSER_CHECKBOX": {
+    "expires_in_version": "53",
+    "kind": "boolean",
+    "releaseChannelCollection": "opt-out",
+    "description": "True if the checkbox to set the browser as default was hidden in the installer (Windows only)"
+  },
+  "STUB_INSTALLER_SET_AS_DEFAULT_REQUESTED": {
+    "expires_in_version": "53",
+    "kind": "enumerated",
+    "n_values": 4,
+    "releaseChannelCollection": "opt-out",
+    "description": "If Firefox was requested to be set as default from the stub installer (Windows only). (0=Cannot set as default, Win7 or less, 1=Cannot set as default, at least Win8, 2=Can set as default and set as default requested, 3=Can set as default but 'set as default' was not requested)"
+  },
+  "STUB_INSTALLER_SET_AS_DEFAULT_RESULT": {
+    "expires_in_version": "53",
+    "kind": "enumerated",
+    "n_values": 3,
+    "releaseChannelCollection": "opt-out",
+    "description": "The result of attempting to set Firefox as the default in the stub installer (Windows only). (0=Firefox is not set as default, 1=This Firefox install is set as default, 2=Another Firefox install is set as default)"
+  },
   "BROWSER_IS_ASSIST_DEFAULT": {
     "expires_in_version": "never",
     "kind": "boolean",
     "description": "The result of the default browser check for assist intent."
   },
   "MIXED_CONTENT_PAGE_LOAD": {
     "expires_in_version": "never",
     "kind": "enumerated",