diff --git a/chrome/content/zotero/feedSettings.js b/chrome/content/zotero/feedSettings.js
index 6b223d638f..daeb25b71f 100644
--- a/chrome/content/zotero/feedSettings.js
+++ b/chrome/content/zotero/feedSettings.js
@@ -48,6 +48,9 @@ var Zotero_Feed_Settings = new function() {
 	};
 	
 	this.init = Zotero.Promise.coroutine(function* () {
+		document.addEventListener('dialogaccept', this.accept.bind(this));
+		document.addEventListener('dialogcancel', this.cancel.bind(this));
+		
 		this.toggleAdvancedOptions(false);
 		
 		data = window.arguments[0];
@@ -99,7 +102,7 @@ var Zotero_Feed_Settings = new function() {
 		document.getElementById('feed-ttl').disabled = true;
 		document.getElementById('feed-cleanupReadAfter').disabled = true;
 		document.getElementById('feed-cleanupUnreadAfter').disabled = true;
-		document.documentElement.getButton('accept').disabled = true;
+		document.querySelector('dialog').getButton('accept').disabled = true;
 	};
 	
 	this.validateURL = Zotero.Promise.coroutine(function* () {
@@ -137,7 +140,7 @@ var Zotero_Feed_Settings = new function() {
 			ttl.disabled = false;
 			document.getElementById('feed-cleanupReadAfter').disabled = false;
 			document.getElementById('feed-cleanupUnreadAfter').disabled = false;
-			document.documentElement.getButton('accept').disabled = false;
+			document.querySelector('dialog').getButton('accept').disabled = false;
 		}
 		catch (e) {
 			Zotero.debug(e);
diff --git a/chrome/content/zotero/feedSettings.xul b/chrome/content/zotero/feedSettings.xhtml
similarity index 92%
rename from chrome/content/zotero/feedSettings.xul
rename to chrome/content/zotero/feedSettings.xhtml
index 27a8ab36ed..ce0e1e3ce6 100644
--- a/chrome/content/zotero/feedSettings.xul
+++ b/chrome/content/zotero/feedSettings.xhtml
@@ -5,16 +5,16 @@
 <!DOCTYPE window [
 	<!ENTITY % zoteroDTD SYSTEM "chrome://zotero/locale/zotero.dtd" > %zoteroDTD;
 ]>
-<dialog xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+<window type="child"
+	xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
 	xmlns:html="http://www.w3.org/1999/xhtml"
 	title="&zotero.feedSettings.title;" buttons="cancel,accept"
 	buttonlabelaccept="&zotero.feedSettings.saveButton.label;"
-	ondialogaccept="return Zotero_Feed_Settings.accept()"
-	ondialogcancel="return Zotero_Feed_Settings.cancel()"
 	id="zotero-feed-settings"
 	onload="Zotero_Feed_Settings.init()">
-	
+<dialog>
 	<script src="include.js"/>
+	<script src="chrome://global/content/customElements.js"/>
 	<script src="feedSettings.js"/>
 	
 	<grid>
@@ -66,4 +66,5 @@
 			</hbox>
 		</vbox>
 	</vbox>
-</dialog>
\ No newline at end of file
+</dialog>
+</window>
diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index cf980a1b87..b39a27d9ae 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -1086,7 +1086,7 @@ var ZoteroPane = new function()
 	
 	this.newFeedFromURL = Zotero.Promise.coroutine(function* () {
 		let data = {};
-		window.openDialog('chrome://zotero/content/feedSettings.xul', 
+		window.openDialog('chrome://zotero/content/feedSettings.xhtml',
 			null, 'centerscreen, modal', data);
 		if (!data.cancelled) {
 			let feed = new Zotero.Feed();
@@ -2203,7 +2203,7 @@ var ZoteroPane = new function()
 			cleanupUnreadAfter: feed.cleanupUnreadAfter
 		};
 		
-		window.openDialog('chrome://zotero/content/feedSettings.xul', 
+		window.openDialog('chrome://zotero/content/feedSettings.xhtml',
 			null, 'centerscreen, modal', data);
 		if (data.cancelled) return;