diff --git a/calendar/base/content/calendar-alarm-dialog.js b/calendar/base/content/calendar-alarm-dialog.js
index 59689c576f1..57a10852acb 100644
--- a/calendar/base/content/calendar-alarm-dialog.js
+++ b/calendar/base/content/calendar-alarm-dialog.js
@@ -19,6 +19,7 @@
  *
  * Contributor(s):
  *   Stuart Parmenter <stuart.parmenter@oracle.com>
+ *   Philipp Kewisch <mozilla@kewis.ch>
  *
  * Alternatively, the contents of this file may be used under the terms of
  * either the GNU General Public License Version 2 or later (the "GPL"), or
@@ -99,6 +100,9 @@ function onSnoozeAlarm(event)
 
   alarmService.snoozeEvent(alarmWidget.item, duration);
 
+  alarmWidget.removeEventListener("snooze", onSnoozeAlarm, false);
+  alarmWidget.removeEventListener("dismiss", onDismissAlarm, false);
+
   var parent = alarmWidget.parentNode;
   parent.removeChild(alarmWidget);
   if (!parent.hasChildNodes()) {
@@ -131,6 +135,9 @@ function onDismissWidget(alarmWidget) {
   }
   item.calendar.modifyItem(item, alarmWidget.item, null);
 
+  alarmWidget.removeEventListener("snooze", onSnoozeAlarm, false);
+  alarmWidget.removeEventListener("dismiss", onDismissAlarm, false);
+
   var parent = alarmWidget.parentNode;
   parent.removeChild(alarmWidget);
 
@@ -140,4 +147,3 @@ function onDismissWidget(alarmWidget) {
   }
 
 }
-
diff --git a/calendar/base/content/calendar-multiday-view.xml b/calendar/base/content/calendar-multiday-view.xml
index 433d0262c39..f0fe60005a5 100644
--- a/calendar/base/content/calendar-multiday-view.xml
+++ b/calendar/base/content/calendar-multiday-view.xml
@@ -1912,8 +1912,11 @@
       ]]></constructor>
 
       <destructor><![CDATA[
-        if (this.mCalendar)
+        if (this.mCalendar) {
             this.mCalendar.removeObserver(this.mObserver);
+        }
+        window.removeEventListener("scroll", this.mScrollHandler, true);
+        window.removeEventListener("resize", this.mResizeHandler, true);
       ]]></destructor>
 
       <property name="daysInView" readonly="true">