diff --git a/browser/base/content/tabbrowser.xml b/browser/base/content/tabbrowser.xml
index 691bc131893..1b8362c9904 100644
--- a/browser/base/content/tabbrowser.xml
+++ b/browser/base/content/tabbrowser.xml
@@ -1264,8 +1264,10 @@
               setTimeout(function (tabContainer) {
                 if (t.pinned)
                   tabContainer._handleNewTab(t);
-                else
+                else {
+                  t._animStartTime = Date.now();
                   t.setAttribute("fadein", "true");
+                }
               }, 0, this.tabContainer);
             }
 
@@ -1526,6 +1528,8 @@
               return;
             }
 
+            aTab._animStartTime = Date.now();
+
             this._blurTab(aTab);
             aTab.style.maxWidth = ""; // ensure that fade-out transition happens
             aTab.removeAttribute("fadein");
@@ -3257,6 +3261,14 @@
 
         var tab = event.target;
 
+        if (tab._animStartTime) {
+          Services.telemetry.getHistogramById(tab.closing ?
+                                              "FX_TAB_ANIM_CLOSE_MS" :
+                                              "FX_TAB_ANIM_OPEN_MS")
+                            .add(Date.now() - tab._animStartTime);
+          tab._animStartTime = 0;
+        }
+
         if (tab.getAttribute("fadein") == "true") {
           if (tab._fullyOpen)
             this.adjustTabstrip();
diff --git a/toolkit/components/telemetry/TelemetryHistograms.h b/toolkit/components/telemetry/TelemetryHistograms.h
index a11b77a520c..ab797eda9c7 100644
--- a/toolkit/components/telemetry/TelemetryHistograms.h
+++ b/toolkit/components/telemetry/TelemetryHistograms.h
@@ -294,7 +294,9 @@ HISTOGRAM(THUNDERBIRD_INDEXING_RATE_MSG_PER_S, 1, 100, 20, LINEAR, "Gloda: index
  * Firefox-specific telemetry.
  */
 #ifdef MOZ_PHOENIX
-HISTOGRAM(FX_CONTEXT_SEARCH_AND_TAB_SELECT, 0, 1, 2, BOOLEAN, "Firefox: Background tab was selected within 5 seconds of searching from the context menu")
+HISTOGRAM(FX_TAB_ANIM_OPEN_MS, 1, 3000, 10, EXPONENTIAL, "Firefox: Time taken by the tab opening animation")
+HISTOGRAM(FX_TAB_ANIM_CLOSE_MS, 1, 3000, 10, EXPONENTIAL, "Firefox: Time taken by the tab closing animation")
+HISTOGRAM_BOOLEAN(FX_CONTEXT_SEARCH_AND_TAB_SELECT, "Firefox: Background tab was selected within 5 seconds of searching from the context menu")
 #endif
 
 HISTOGRAM_BOOLEAN(INNERWINDOWS_WITH_MUTATION_LISTENERS, "Deleted or to-be-reused innerwindow which has had mutation event listeners.")