diff --git a/src/_h5ai/public/js/lib/ext/autorefresh.js b/src/_h5ai/public/js/lib/ext/autorefresh.js
index 3f4c485b..719533e4 100644
--- a/src/_h5ai/public/js/lib/ext/autorefresh.js
+++ b/src/_h5ai/public/js/lib/ext/autorefresh.js
@@ -3,7 +3,6 @@ const event = require('../core/event');
 const location = require('../core/location');
 const allsettings = require('../core/settings');
 
-
 const settings = Object.assign({
     enabled: false,
     interval: 5000
@@ -11,20 +10,20 @@ const settings = Object.assign({
 let timeoutId = null;
 
 
-function heartbeat() {
+const heartbeat = () => {
     location.refresh();
-}
+};
 
-function before() {
+const before = () => {
     win.clearTimeout(timeoutId);
-}
+};
 
-function after() {
+const after = () => {
     win.clearTimeout(timeoutId);
     timeoutId = win.setTimeout(heartbeat, settings.interval);
-}
+};
 
-function init() {
+const init = () => {
     if (!settings.enabled) {
         return;
     }
@@ -35,7 +34,7 @@ function init() {
     event.sub('location.beforeRefresh', before);
     event.sub('location.changed', after);
     event.sub('location.refreshed', after);
-}
+};
 
 
 init();
diff --git a/src/_h5ai/public/js/lib/ext/crumb.js b/src/_h5ai/public/js/lib/ext/crumb.js
index 6ed2ad57..1b729732 100644
--- a/src/_h5ai/public/js/lib/ext/crumb.js
+++ b/src/_h5ai/public/js/lib/ext/crumb.js
@@ -20,7 +20,7 @@ const pageHintTemplate =
 let $crumbbar;
 
 
-function createHtml(item) {
+const createHtml = item => {
     const $html = jq(crumbTemplate);
     $html[0]._item = item;
     item.elCrumb = $html[0];
@@ -37,9 +37,9 @@ function createHtml(item) {
     }
 
     return $html;
-}
+};
 
-function onLocationChanged(item) {
+const onLocationChanged = item => {
     const $crumb = jq(item.elCrumb);
 
     if ($crumb && $crumb.parent()[0] === $crumbbar[0]) {
@@ -51,9 +51,9 @@ function onLocationChanged(item) {
             $crumbbar.append(createHtml(crumbItem));
         });
     }
-}
+};
 
-function init() {
+const init = () => {
     if (!settings.enabled) {
         return;
     }
@@ -61,7 +61,7 @@ function init() {
     $crumbbar = jq('<div id="crumbbar"/>').appendTo(base.$flowbar);
 
     event.sub('location.changed', onLocationChanged);
-}
+};
 
 
 init();
diff --git a/src/_h5ai/public/js/lib/ext/custom.js b/src/_h5ai/public/js/lib/ext/custom.js
index cbe61b69..7250b64a 100644
--- a/src/_h5ai/public/js/lib/ext/custom.js
+++ b/src/_h5ai/public/js/lib/ext/custom.js
@@ -12,7 +12,7 @@ let $footer;
 const duration = 200;
 
 
-function onLocationChanged(item) {
+const onLocationChanged = item => {
     server.request({action: 'get', custom: item.absHref}).then(response => {
         const custom = response && response.custom;
         let hasHeader;
@@ -49,9 +49,9 @@ function onLocationChanged(item) {
             $footer.stop().slideUp(duration);
         }
     });
-}
+};
 
-function init() {
+const init = () => {
     if (!settings.enabled) {
         return;
     }
@@ -60,7 +60,7 @@ function init() {
     $footer = jq('<div id="content-footer"/>').hide().appendTo('#content');
 
     event.sub('location.changed', onLocationChanged);
-}
+};
 
 
 init();
diff --git a/src/_h5ai/public/js/lib/ext/google-analytics.js b/src/_h5ai/public/js/lib/ext/google-analytics.js
index edc2a3e8..e6436a99 100644
--- a/src/_h5ai/public/js/lib/ext/google-analytics.js
+++ b/src/_h5ai/public/js/lib/ext/google-analytics.js
@@ -9,16 +9,16 @@ const settings = Object.assign({
     id: 'UA-000000-0'
 }, allsettings['google-analytics-ua']);
 
-function snippet() {
+const snippet = () => {
     /* eslint-disable */
     (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
     (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
     m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
     })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
     /* eslint-enable */
-}
+};
 
-function init() {
+const init = () => {
     if (!settings.enabled) {
         return;
     }
@@ -34,6 +34,6 @@ function init() {
             title: map(item.getCrumb(), i => i.label).join(' > ')
         });
     });
-}
+};
 
 init();
diff --git a/src/_h5ai/public/js/lib/ext/title.js b/src/_h5ai/public/js/lib/ext/title.js
index 35d80dde..6eddeaa7 100644
--- a/src/_h5ai/public/js/lib/ext/title.js
+++ b/src/_h5ai/public/js/lib/ext/title.js
@@ -9,7 +9,7 @@ const settings = Object.assign({
     enabled: false
 }, allsettings.title);
 
-function onLocationChanged(item) {
+const onLocationChanged = item => {
     const labels = map(item.getCrumb(), i => i.label);
     let title = labels.join(' > ');
 
@@ -18,14 +18,14 @@ function onLocationChanged(item) {
     }
 
     doc.title = title;
-}
+};
 
-function init() {
+const init = () => {
     if (!settings.enabled) {
         return;
     }
 
     event.sub('location.changed', onLocationChanged);
-}
+};
 
 init();