diff --git a/extensions/firefox/content/PdfJsTelemetry-addon.jsm b/extensions/firefox/content/PdfJsTelemetry-addon.jsm
index e22903d97..f1dc908ed 100644
--- a/extensions/firefox/content/PdfJsTelemetry-addon.jsm
+++ b/extensions/firefox/content/PdfJsTelemetry-addon.jsm
@@ -31,6 +31,7 @@ Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_FALLBACK_SHOWN", 1, 2, 3,
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_DOCUMENT_VERSION", 1, 10, 11, Telemetry.HISTOGRAM_LINEAR);
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_DOCUMENT_GENERATOR", 1, 25, 26, Telemetry.HISTOGRAM_LINEAR);
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_DOCUMENT_SIZE_KB", 2, 64 * 1024, 20, Telemetry.HISTOGRAM_EXPONENTIAL);
+Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_EMBED", 1, 2, 3, Telemetry.HISTOGRAM_BOOLEAN);
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_FONT_TYPES", 1, 19, 20, Telemetry.HISTOGRAM_LINEAR);
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_FORM", 1, 2, 3, Telemetry.HISTOGRAM_BOOLEAN);
 Telemetry.registerAddonHistogram(ADDON_ID, "PDF_VIEWER_PRINT", 1, 2, 3, Telemetry.HISTOGRAM_BOOLEAN);
@@ -59,6 +60,10 @@ this.PdfJsTelemetry = {
     let histogram = Telemetry.getAddonHistogram(ADDON_ID, "PDF_VIEWER_DOCUMENT_GENERATOR");
     histogram.add(generatorId);
   },
+  onEmbed: function (isObject) {
+    let histogram = Telemetry.getAddonHistogram(ADDON_ID, "PDF_VIEWER_EMBED");
+    histogram.add(isObject);
+  },
   onFontType: function (fontTypeId) {
     let histogram = Telemetry.getAddonHistogram(ADDON_ID, "PDF_VIEWER_FONT_TYPES");
     histogram.add(fontTypeId);
diff --git a/extensions/firefox/content/PdfJsTelemetry.jsm b/extensions/firefox/content/PdfJsTelemetry.jsm
index dd5c0c063..52eea6207 100644
--- a/extensions/firefox/content/PdfJsTelemetry.jsm
+++ b/extensions/firefox/content/PdfJsTelemetry.jsm
@@ -44,6 +44,10 @@ this.PdfJsTelemetry = {
     let histogram = Services.telemetry.getHistogramById("PDF_VIEWER_DOCUMENT_GENERATOR");
     histogram.add(generatorId);
   },
+  onEmbed: function (isObject) {
+    let histogram = Services.telemetry.getHistogramById("PDF_VIEWER_EMBED");
+    histogram.add(isObject);
+  },
   onFontType: function (fontTypeId) {
     let histogram = Services.telemetry.getHistogramById("PDF_VIEWER_FONT_TYPES");
     histogram.add(fontTypeId);
diff --git a/extensions/firefox/content/PdfStreamConverter.jsm b/extensions/firefox/content/PdfStreamConverter.jsm
index 03b319e07..086cd7cf1 100644
--- a/extensions/firefox/content/PdfStreamConverter.jsm
+++ b/extensions/firefox/content/PdfStreamConverter.jsm
@@ -979,6 +979,12 @@ PdfStreamConverter.prototype = {
           findEventManager.bind();
         }
         listener.onStopRequest(aRequest, context, statusCode);
+
+        if (domWindow.frameElement) {
+          var isObjectEmbed = domWindow.frameElement.tagName !== 'IFRAME' ||
+            domWindow.frameElement.className === 'previewPluginContentFrame';
+          PdfJsTelemetry.onEmbed(isObjectEmbed);
+        }
       }
     };