diff --git a/chrome/content/zotero/integration/addCitationDialog.xul b/chrome/content/zotero/integration/addCitationDialog.xul
index cdf1bb3c4f..6c60557505 100644
--- a/chrome/content/zotero/integration/addCitationDialog.xul
+++ b/chrome/content/zotero/integration/addCitationDialog.xul
@@ -41,6 +41,7 @@
 	onunload="doUnload();"
 	ondialogaccept="return Zotero_Citation_Dialog.accept();"
 	ondialogcancel="Zotero_Citation_Dialog.cancel();"
+	onclose="Zotero_Citation_Dialog.cancel(); event.preventDefault(); event.stopPropagation();"
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
 	persist="screenX screenY width height"
 	resizable="true"
diff --git a/chrome/content/zotero/integration/editBibliographyDialog.xul b/chrome/content/zotero/integration/editBibliographyDialog.xul
index eb7e673286..f1123cbc49 100644
--- a/chrome/content/zotero/integration/editBibliographyDialog.xul
+++ b/chrome/content/zotero/integration/editBibliographyDialog.xul
@@ -38,7 +38,7 @@
 	onload="Zotero_Bibliography_Dialog.load();"
 	ondialogaccept="Zotero_Bibliography_Dialog.accept();"
 	ondialogcancel="Zotero_Bibliography_Dialog.close();"
-	onclose="Zotero_Bibliography_Dialog.close();"
+	onclose="Zotero_Bibliography_Dialog.close(); event.preventDefault(); event.stopPropagation();"
 	onunload="doUnload();"
 	buttons="extra1,extra2,accept,cancel" buttonpack="end"
 	xmlns:html="http://www.w3.org/1999/xhtml"
diff --git a/chrome/content/zotero/integration/integrationDocPrefs.xul b/chrome/content/zotero/integration/integrationDocPrefs.xul
index f80ee1a138..4f47d8960c 100644
--- a/chrome/content/zotero/integration/integrationDocPrefs.xul
+++ b/chrome/content/zotero/integration/integrationDocPrefs.xul
@@ -35,6 +35,7 @@
 	title="&zotero.integration.docPrefs.title;"
 	onload="Zotero_File_Interface_Bibliography.init();"
 	ondialogaccept="Zotero_File_Interface_Bibliography.acceptSelection();"
+	onclose="document.documentElement.cancelDialog(); event.preventDefault(); event.stopPropagation();"
 	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
 	persist="screenX screenY"
 	style="width: 600px">