diff --git a/src/_h5ai/public/js/lib/ext/contextmenu.js b/src/_h5ai/public/js/lib/ext/contextmenu.js
index 76f94e53..92ebb897 100644
--- a/src/_h5ai/public/js/lib/ext/contextmenu.js
+++ b/src/_h5ai/public/js/lib/ext/contextmenu.js
@@ -1,9 +1,10 @@
-const {win, jq, lo} = require('../globals');
+const {each} = require('../lo');
+const {win, jq} = require('../globals');
 const resource = require('../core/resource');
 const allsettings = require('../core/settings');
 
 const doc = win.document;
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false
 }, allsettings.contextmenu);
 const templateOverlay = '<div id="cm-overlay"/>';
@@ -37,7 +38,7 @@ function createPanel(menu) {
     const $ul = $panel.find('ul');
     let $li;
 
-    lo.each(menu, entry => {
+    each(menu, entry => {
         if (entry.type === '-') {
             jq(templateSep).appendTo($ul);
         } else if (entry.type === 'l') {
diff --git a/src/_h5ai/public/js/lib/ext/crumb.js b/src/_h5ai/public/js/lib/ext/crumb.js
index 5e75fafd..6ed2ad57 100644
--- a/src/_h5ai/public/js/lib/ext/crumb.js
+++ b/src/_h5ai/public/js/lib/ext/crumb.js
@@ -1,4 +1,5 @@
-const {jq, lo} = require('../globals');
+const {each} = require('../lo');
+const {jq} = require('../globals');
 const event = require('../core/event');
 const location = require('../core/location');
 const resource = require('../core/resource');
@@ -6,7 +7,7 @@ const allsettings = require('../core/settings');
 const base = require('../view/base');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false
 }, allsettings.crumb);
 const crumbTemplate =
@@ -46,7 +47,7 @@ function onLocationChanged(item) {
         $crumb.addClass('active');
     } else {
         $crumbbar.empty();
-        lo.each(item.getCrumb(), crumbItem => {
+        each(item.getCrumb(), crumbItem => {
             $crumbbar.append(createHtml(crumbItem));
         });
     }
diff --git a/src/_h5ai/public/js/lib/ext/custom.js b/src/_h5ai/public/js/lib/ext/custom.js
index e91da71f..cbe61b69 100644
--- a/src/_h5ai/public/js/lib/ext/custom.js
+++ b/src/_h5ai/public/js/lib/ext/custom.js
@@ -1,10 +1,10 @@
-const {jq, lo, marked} = require('../globals');
+const {jq, marked} = require('../globals');
 const server = require('../server');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false
 }, allsettings.custom);
 let $header;
diff --git a/src/_h5ai/public/js/lib/ext/download.js b/src/_h5ai/public/js/lib/ext/download.js
index b96fe439..72e29899 100644
--- a/src/_h5ai/public/js/lib/ext/download.js
+++ b/src/_h5ai/public/js/lib/ext/download.js
@@ -1,11 +1,12 @@
-const {jq, lo} = require('../globals');
+const {each} = require('../lo');
+const {jq} = require('../globals');
 const server = require('../server');
 const event = require('../core/event');
 const location = require('../core/location');
 const resource = require('../core/resource');
 const allsettings = require('../core/settings');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     type: 'php-tar',
     packageName: 'package',
@@ -48,7 +49,7 @@ function onClick() {
         baseHref: location.getAbsHref()
     };
 
-    lo.each(selectedItems, (item, idx) => {
+    each(selectedItems, (item, idx) => {
         query['hrefs[' + idx + ']'] = item.absHref;
     });
 
diff --git a/src/_h5ai/public/js/lib/ext/filter.js b/src/_h5ai/public/js/lib/ext/filter.js
index 9c975d18..03dcf87e 100644
--- a/src/_h5ai/public/js/lib/ext/filter.js
+++ b/src/_h5ai/public/js/lib/ext/filter.js
@@ -1,4 +1,5 @@
-const {jq, lo} = require('../globals');
+const {each, debounce} = require('../lo');
+const {jq} = require('../globals');
 const event = require('../core/event');
 const location = require('../core/location');
 const resource = require('../core/resource');
@@ -7,7 +8,7 @@ const util = require('../core/util');
 const view = require('../view/view');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     advanced: false,
     debounceTime: 100,
@@ -41,7 +42,7 @@ function filter(pattern) {
     const re = new RegExp(pattern, settings.ignorecase ? 'i' : '');
     const matchedItems = [];
 
-    lo.each(location.getItem().content, item => {
+    each(location.getItem().content, item => {
         if (re.test(item.label)) {
             matchedItems.push(item);
         }
@@ -83,7 +84,7 @@ function init() {
     $input = $filter.find('input');
 
     $filter.on('click', 'img', toggle);
-    $input.on('keyup', lo.debounce(update, settings.debounceTime, {trailing: true}));
+    $input.on('keyup', debounce(update, settings.debounceTime, {trailing: true}));
     event.sub('location.changed', reset);
 }
 
diff --git a/src/_h5ai/public/js/lib/ext/google-analytics.js b/src/_h5ai/public/js/lib/ext/google-analytics.js
index 8d838ebe..edc2a3e8 100644
--- a/src/_h5ai/public/js/lib/ext/google-analytics.js
+++ b/src/_h5ai/public/js/lib/ext/google-analytics.js
@@ -1,9 +1,10 @@
-const {win, lo} = require('../globals');
+const {map} = require('../lo');
+const {win} = require('../globals');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     id: 'UA-000000-0'
 }, allsettings['google-analytics-ua']);
@@ -30,7 +31,7 @@ function init() {
         const loc = win.location;
         win.ga('send', 'pageview', {
             location: loc.protocol + '//' + loc.host + item.absHref,
-            title: lo.map(item.getCrumb(), 'label').join(' > ')
+            title: map(item.getCrumb(), i => i.label).join(' > ')
         });
     });
 }
diff --git a/src/_h5ai/public/js/lib/ext/info.js b/src/_h5ai/public/js/lib/ext/info.js
index 7bed10bd..68363440 100644
--- a/src/_h5ai/public/js/lib/ext/info.js
+++ b/src/_h5ai/public/js/lib/ext/info.js
@@ -1,4 +1,5 @@
-const {win, jq, lo, kjua} = require('../globals');
+const {isNum} = require('../lo');
+const {win, jq, kjua} = require('../globals');
 const event = require('../core/event');
 const format = require('../core/format');
 const resource = require('../core/resource');
@@ -6,7 +7,7 @@ const allsettings = require('../core/settings');
 const store = require('../core/store');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     show: false,
     qrcode: true,
@@ -71,13 +72,13 @@ function update(item) {
     }
 
     $label.text(item.label);
-    if (lo.isNumber(item.time)) {
+    if (isNum(item.time)) {
         $time.text(format.formatDate(item.time));
     } else {
         $time.text('.');
     }
 
-    if (lo.isNumber(item.size)) {
+    if (isNum(item.size)) {
         $size.text(format.formatSize(item.size));
         $size.show();
     } else {
diff --git a/src/_h5ai/public/js/lib/ext/l10n.js b/src/_h5ai/public/js/lib/ext/l10n.js
index 7ba8efe6..ca5e6258 100644
--- a/src/_h5ai/public/js/lib/ext/l10n.js
+++ b/src/_h5ai/public/js/lib/ext/l10n.js
@@ -1,4 +1,5 @@
-const {win, jq, lo} = require('../globals');
+const {keys, isStr} = require('../lo');
+const {win, jq} = require('../globals');
 const server = require('../server');
 const event = require('../core/event');
 const format = require('../core/format');
@@ -6,7 +7,7 @@ const langs = require('../core/langs');
 const allsettings = require('../core/settings');
 const store = require('../core/store');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     lang: 'en',
     useBrowserLang: true
@@ -44,7 +45,7 @@ const blockTemplate =
 const optionTemplate = '<option/>';
 const storekey = 'ext/l10n';
 const loaded = {
-    en: lo.extend({}, defaultTranslations)
+    en: Object.assign({}, defaultTranslations)
 };
 let currentLang = loaded.en;
 
@@ -77,7 +78,7 @@ function loadLanguage(isoCode, callback) {
     } else {
         server.request({action: 'get', l10n: [isoCode]}).then(response => {
             const json = response.l10n && response.l10n[isoCode] ? response.l10n[isoCode] : {};
-            loaded[isoCode] = lo.extend({}, defaultTranslations, json, {isoCode});
+            loaded[isoCode] = Object.assign({}, defaultTranslations, json, {isoCode});
             callback(loaded[isoCode]);
         });
     }
@@ -107,7 +108,7 @@ function localize(languages, isoCode, useBrowserLang) {
 }
 
 function initLangSelector(languages) {
-    const isoCodes = lo.keys(languages).sort();
+    const isoCodes = keys(languages).sort();
     const $block = jq(blockTemplate);
     const $select = $block.find('select')
         .on('change', ev => {
@@ -120,7 +121,7 @@ function initLangSelector(languages) {
         jq(optionTemplate)
             .attr('value', isoCode)
             .addClass(isoCode)
-            .text(isoCode + ' - ' + (lo.isString(languages[isoCode]) ? languages[isoCode] : languages[isoCode].lang))
+            .text(isoCode + ' - ' + (isStr(languages[isoCode]) ? languages[isoCode] : languages[isoCode].lang))
             .appendTo($select);
     });
 
diff --git a/src/_h5ai/public/js/lib/ext/peer5.js b/src/_h5ai/public/js/lib/ext/peer5.js
index 323c2855..d27a451a 100644
--- a/src/_h5ai/public/js/lib/ext/peer5.js
+++ b/src/_h5ai/public/js/lib/ext/peer5.js
@@ -1,7 +1,7 @@
-const {win, jq, lo} = require('../globals');
+const {win, jq} = require('../globals');
 const allsettings = require('../core/settings');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     id: 'z142i5n5qypq4cxr'
 }, allsettings.peer5);
diff --git a/src/_h5ai/public/js/lib/ext/piwik-analytics.js b/src/_h5ai/public/js/lib/ext/piwik-analytics.js
index 2ad4e5ee..074ce7f2 100644
--- a/src/_h5ai/public/js/lib/ext/piwik-analytics.js
+++ b/src/_h5ai/public/js/lib/ext/piwik-analytics.js
@@ -1,9 +1,10 @@
-const {win, jq, lo} = require('../globals');
+const {map} = require('../lo');
+const {win, jq} = require('../globals');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     baseURL: 'not-set',
     idSite: 0
@@ -26,7 +27,7 @@ function init() {
     });
 
     event.sub('location.changed', item => {
-        const title = lo.map(item.getCrumb(), 'label').join(' > ');
+        const title = map(item.getCrumb(), i => i.label).join(' > ');
         piwikTracker.trackPageView(title);
     });
 }
diff --git a/src/_h5ai/public/js/lib/ext/preview-aud.js b/src/_h5ai/public/js/lib/ext/preview-aud.js
index e4c39f36..5033838f 100644
--- a/src/_h5ai/public/js/lib/ext/preview-aud.js
+++ b/src/_h5ai/public/js/lib/ext/preview-aud.js
@@ -1,10 +1,11 @@
-const {win, jq, lo} = require('../globals');
+const {each, map, includes, compact} = require('../lo');
+const {win, jq} = require('../globals');
 const event = require('../core/event');
 const format = require('../core/format');
 const allsettings = require('../core/settings');
 const preview = require('./preview');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     types: []
 }, allsettings['preview-aud']);
@@ -81,22 +82,22 @@ function onEnter(items, idx) {
 }
 
 function initItem(item) {
-    if (item.$view && lo.includes(settings.types, item.type)) {
+    if (item.$view && includes(settings.types, item.type)) {
         item.$view.find('a').on('click', ev => {
             ev.preventDefault();
 
-            const matchedItems = lo.compact(lo.map(jq('#items .item'), el => {
+            const matchedItems = compact(map(jq('#items .item'), el => {
                 const matchedItem = el._item;
-                return lo.includes(settings.types, matchedItem.type) ? matchedItem : null;
+                return includes(settings.types, matchedItem.type) ? matchedItem : null;
             }));
 
-            onEnter(matchedItems, lo.indexOf(matchedItems, item));
+            onEnter(matchedItems, matchedItems.indexOf(item));
         });
     }
 }
 
 function onViewChanged(added) {
-    lo.each(added, initItem);
+    each(added, initItem);
 }
 
 function init() {
diff --git a/src/_h5ai/public/js/lib/ext/preview-img.js b/src/_h5ai/public/js/lib/ext/preview-img.js
index 3e557a81..a33546d7 100644
--- a/src/_h5ai/public/js/lib/ext/preview-img.js
+++ b/src/_h5ai/public/js/lib/ext/preview-img.js
@@ -1,10 +1,11 @@
-const {win, jq, lo} = require('../globals');
+const {each, map, includes, compact} = require('../lo');
+const {win, jq} = require('../globals');
 const server = require('../server');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 const preview = require('./preview');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     size: null,
     types: []
@@ -112,22 +113,22 @@ function onEnter(items, idx) {
 }
 
 function initItem(item) {
-    if (item.$view && lo.includes(settings.types, item.type)) {
+    if (item.$view && includes(settings.types, item.type)) {
         item.$view.find('a').on('click', ev => {
             ev.preventDefault();
 
-            const matchedItems = lo.compact(lo.map(jq('#items .item'), el => {
+            const matchedItems = compact(map(jq('#items .item'), el => {
                 const matchedItem = el._item;
-                return lo.includes(settings.types, matchedItem.type) ? matchedItem : null;
+                return includes(settings.types, matchedItem.type) ? matchedItem : null;
             }));
 
-            onEnter(matchedItems, lo.indexOf(matchedItems, item));
+            onEnter(matchedItems, matchedItems.indexOf(item));
         });
     }
 }
 
 function onViewChanged(added) {
-    lo.each(added, initItem);
+    each(added, initItem);
 }
 
 function init() {
diff --git a/src/_h5ai/public/js/lib/ext/preview-txt.js b/src/_h5ai/public/js/lib/ext/preview-txt.js
index 397f0ff0..6261d419 100644
--- a/src/_h5ai/public/js/lib/ext/preview-txt.js
+++ b/src/_h5ai/public/js/lib/ext/preview-txt.js
@@ -1,10 +1,11 @@
-const {win, jq, lo, marked, prism} = require('../globals');
+const {each, map, keys, includes, compact} = require('../lo');
+const {win, jq, marked, prism} = require('../globals');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 const preview = require('./preview');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     types: {}
 }, allsettings['preview-txt']);
@@ -113,22 +114,22 @@ function onEnter(items, idx) {
 }
 
 function initItem(item) {
-    if (item.$view && lo.includes(lo.keys(settings.types), item.type)) {
+    if (item.$view && includes(keys(settings.types), item.type)) {
         item.$view.find('a').on('click', ev => {
             ev.preventDefault();
 
-            const matchedItems = lo.compact(lo.map(jq('#items .item'), el => {
+            const matchedItems = compact(map(jq('#items .item'), el => {
                 const matchedItem = el._item;
-                return lo.includes(lo.keys(settings.types), matchedItem.type) ? matchedItem : null;
+                return includes(keys(settings.types), matchedItem.type) ? matchedItem : null;
             }));
 
-            onEnter(matchedItems, lo.indexOf(matchedItems, item));
+            onEnter(matchedItems, matchedItems.indexOf(item));
         });
     }
 }
 
 function onViewChanged(added) {
-    lo.each(added, initItem);
+    each(added, initItem);
 }
 
 function init() {
diff --git a/src/_h5ai/public/js/lib/ext/preview-vid.js b/src/_h5ai/public/js/lib/ext/preview-vid.js
index bb11243f..e04dedd7 100644
--- a/src/_h5ai/public/js/lib/ext/preview-vid.js
+++ b/src/_h5ai/public/js/lib/ext/preview-vid.js
@@ -1,9 +1,10 @@
-const {win, jq, lo} = require('../globals');
+const {each, map, includes, compact} = require('../lo');
+const {win, jq} = require('../globals');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 const preview = require('./preview');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     types: []
 }, allsettings['preview-vid']);
@@ -81,22 +82,22 @@ function onEnter(items, idx) {
 }
 
 function initItem(item) {
-    if (item.$view && lo.includes(settings.types, item.type)) {
+    if (item.$view && includes(settings.types, item.type)) {
         item.$view.find('a').on('click', ev => {
             ev.preventDefault();
 
-            const matchedItems = lo.compact(lo.map(jq('#items .item'), el => {
+            const matchedItems = compact(map(jq('#items .item'), el => {
                 const matchedItem = el._item;
-                return lo.includes(settings.types, matchedItem.type) ? matchedItem : null;
+                return includes(settings.types, matchedItem.type) ? matchedItem : null;
             }));
 
-            onEnter(matchedItems, lo.indexOf(matchedItems, item));
+            onEnter(matchedItems, matchedItems.indexOf(item));
         });
     }
 }
 
 function onViewChanged(added) {
-    lo.each(added, initItem);
+    each(added, initItem);
 }
 
 function init() {
diff --git a/src/_h5ai/public/js/lib/ext/preview.js b/src/_h5ai/public/js/lib/ext/preview.js
index 1b096601..c18d5657 100644
--- a/src/_h5ai/public/js/lib/ext/preview.js
+++ b/src/_h5ai/public/js/lib/ext/preview.js
@@ -1,10 +1,11 @@
-const {win, jq, lo} = require('../globals');
+const {each, isFn, isNum} = require('../lo');
+const {win, jq} = require('../globals');
 const resource = require('../core/resource');
 const allsettings = require('../core/settings');
 const store = require('../core/store');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: true
 }, allsettings.preview);
 const $window = jq(win);
@@ -61,14 +62,14 @@ function adjustSize() {
         jq('#pv-bar-fullscreen').find('img').attr('src', resource.image('preview-fullscreen'));
     }
 
-    if (lo.isFunction(onAdjustSize)) {
+    if (isFn(onAdjustSize)) {
         onAdjustSize(1);
     }
 }
 
 function setLabels(labels) {
     jq('#pv-buttons .bar-left').remove();
-    lo.each(labels, label => {
+    each(labels, label => {
         jq('<li/>')
             .addClass('bar-left bar-label')
             .text(label)
@@ -77,13 +78,13 @@ function setLabels(labels) {
 }
 
 function onNext() {
-    if (lo.isFunction(onIndexChange)) {
+    if (isFn(onIndexChange)) {
         onIndexChange(1);
     }
 }
 
 function onPrevious() {
-    if (lo.isFunction(onIndexChange)) {
+    if (isFn(onIndexChange)) {
         onIndexChange(-1);
     }
 }
@@ -146,8 +147,8 @@ function onExit() {
 }
 
 function setIndex(idx, total) {
-    if (lo.isNumber(idx)) {
-        jq('#pv-bar-idx').text(String(idx) + (lo.isNumber(total) ? '/' + String(total) : '')).show();
+    if (isNum(idx)) {
+        jq('#pv-bar-idx').text(String(idx) + (isNum(total) ? '/' + String(total) : '')).show();
     } else {
         jq('#pv-bar-idx').text('').hide();
     }
@@ -170,7 +171,7 @@ function setOnAdjustSize(fn) {
 }
 
 function showSpinner(show, src, millis) {
-    if (!lo.isNumber(millis)) {
+    if (!isNum(millis)) {
         millis = 300;
     }
 
diff --git a/src/_h5ai/public/js/lib/ext/search.js b/src/_h5ai/public/js/lib/ext/search.js
index 277b9191..f3cc6009 100644
--- a/src/_h5ai/public/js/lib/ext/search.js
+++ b/src/_h5ai/public/js/lib/ext/search.js
@@ -1,4 +1,5 @@
-const {jq, lo} = require('../globals');
+const {map, debounce} = require('../lo');
+const {jq} = require('../globals');
 const server = require('../server');
 const event = require('../core/event');
 const location = require('../core/location');
@@ -9,7 +10,7 @@ const Item = require('../model/item');
 const view = require('../view/view');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     advanced: false,
     debounceTime: 300,
@@ -50,9 +51,7 @@ function search(pattern) {
     }).then(response => {
         $search.removeClass('pending');
         view.setHint('noMatch');
-        view.setItems(lo.map(response.search, item => {
-            return Item.get(item);
-        }));
+        view.setItems(map(response.search, item => Item.get(item)));
     });
 }
 
@@ -87,7 +86,7 @@ function init() {
     $input = $search.find('input');
 
     $search.on('click', 'img', toggle);
-    $input.on('keyup', lo.debounce(update, settings.debounceTime, {trailing: true}));
+    $input.on('keyup', debounce(update, settings.debounceTime, {trailing: true}));
     event.sub('location.changed', reset);
 }
 
diff --git a/src/_h5ai/public/js/lib/ext/select.js b/src/_h5ai/public/js/lib/ext/select.js
index 320022fe..fe516320 100644
--- a/src/_h5ai/public/js/lib/ext/select.js
+++ b/src/_h5ai/public/js/lib/ext/select.js
@@ -1,11 +1,12 @@
-const {win, jq, lo} = require('../globals');
+const {each, map} = require('../lo');
+const {win, jq} = require('../globals');
 const event = require('../core/event');
 const resource = require('../core/resource');
 const allsettings = require('../core/settings');
 
 
 const doc = win.document;
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     clickndrag: false,
     checkboxes: false
@@ -26,7 +27,7 @@ const $selectionRect = jq('<div id="selection-rect"/>');
 
 
 function publish() {
-    const items = lo.map(jq('#items .item.selected'), el => el._item);
+    const items = map(jq('#items .item.selected'), el => el._item);
     event.pub('selection', items);
 }
 
@@ -155,10 +156,10 @@ function addCheckbox(item) {
 
 function onViewChanged(added, removed) {
     if (settings.checkboxes) {
-        lo.each(added, addCheckbox);
+        each(added, addCheckbox);
     }
 
-    lo.each(removed, item => {
+    each(removed, item => {
         if (item.$view) {
             item.$view.removeClass('selected');
         }
diff --git a/src/_h5ai/public/js/lib/ext/sort.js b/src/_h5ai/public/js/lib/ext/sort.js
index 4641409b..625cf07a 100644
--- a/src/_h5ai/public/js/lib/ext/sort.js
+++ b/src/_h5ai/public/js/lib/ext/sort.js
@@ -1,11 +1,11 @@
-const {jq, lo} = require('../globals');
+const {jq} = require('../globals');
 const event = require('../core/event');
 const resource = require('../core/resource');
 const allsettings = require('../core/settings');
 const store = require('../core/store');
 const util = require('../core/util');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     column: 0,
     reverse: false,
diff --git a/src/_h5ai/public/js/lib/ext/thumbnails.js b/src/_h5ai/public/js/lib/ext/thumbnails.js
index 15fb1254..345a28ca 100644
--- a/src/_h5ai/public/js/lib/ext/thumbnails.js
+++ b/src/_h5ai/public/js/lib/ext/thumbnails.js
@@ -1,9 +1,9 @@
-const {lo} = require('../globals');
+const {each, map, includes} = require('../lo');
 const server = require('../server');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     img: ['img-bmp', 'img-gif', 'img-ico', 'img-jpg', 'img-png'],
     mov: ['vid-avi', 'vid-flv', 'vid-mkv', 'vid-mov', 'vid-mp4', 'vid-mpg', 'vid-webm'],
@@ -18,11 +18,11 @@ const landscapeRatio = 4 / 3;
 function queueItem(queue, item) {
     let type = null;
 
-    if (lo.includes(settings.img, item.type)) {
+    if (includes(settings.img, item.type)) {
         type = 'img';
-    } else if (lo.includes(settings.mov, item.type)) {
+    } else if (includes(settings.mov, item.type)) {
         type = 'mov';
-    } else if (lo.includes(settings.doc, item.type)) {
+    } else if (includes(settings.doc, item.type)) {
         type = 'doc';
     } else {
         return;
@@ -62,7 +62,7 @@ function queueItem(queue, item) {
 }
 
 function requestQueue(queue) {
-    const thumbs = lo.map(queue, req => {
+    const thumbs = map(queue, req => {
         return {
             type: req.type,
             href: req.href,
@@ -75,7 +75,7 @@ function requestQueue(queue) {
         action: 'get',
         thumbs
     }).then(json => {
-        lo.each(queue, (req, idx) => {
+        each(queue, (req, idx) => {
             req.callback(json && json.thumbs ? json.thumbs[idx] : null);
         });
     });
@@ -84,7 +84,7 @@ function requestQueue(queue) {
 function handleItems(items) {
     const queue = [];
 
-    lo.each(items, item => {
+    each(items, item => {
         queueItem(queue, item);
     });
 
diff --git a/src/_h5ai/public/js/lib/ext/title.js b/src/_h5ai/public/js/lib/ext/title.js
index 6b81e2b1..35d80dde 100644
--- a/src/_h5ai/public/js/lib/ext/title.js
+++ b/src/_h5ai/public/js/lib/ext/title.js
@@ -1,15 +1,16 @@
-const {win, lo} = require('../globals');
+const {map} = require('../lo');
+const {win} = require('../globals');
 const event = require('../core/event');
 const allsettings = require('../core/settings');
 
 
 const doc = win.document;
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false
 }, allsettings.title);
 
 function onLocationChanged(item) {
-    const labels = lo.map(item.getCrumb(), 'label');
+    const labels = map(item.getCrumb(), i => i.label);
     let title = labels.join(' > ');
 
     if (labels.length > 1) {
diff --git a/src/_h5ai/public/js/lib/ext/tree.js b/src/_h5ai/public/js/lib/ext/tree.js
index 8682f09b..f85eccc5 100644
--- a/src/_h5ai/public/js/lib/ext/tree.js
+++ b/src/_h5ai/public/js/lib/ext/tree.js
@@ -1,4 +1,5 @@
-const {jq, lo} = require('../globals');
+const {each} = require('../lo');
+const {jq} = require('../globals');
 const event = require('../core/event');
 const location = require('../core/location');
 const resource = require('../core/resource');
@@ -7,7 +8,7 @@ const store = require('../core/store');
 const util = require('../core/util');
 
 
-const settings = lo.extend({
+const settings = Object.assign({
     enabled: false,
     show: true,
     maxSubfolders: 50,
@@ -87,7 +88,7 @@ function update(item) {
 
             const $ul = jq('<ul class="content"/>').appendTo($html);
             let counter = 0;
-            lo.each(subfolders, e => {
+            each(subfolders, e => {
                 counter += 1;
                 if (counter <= settings.maxSubfolders) {
                     jq('<li/>').append(update(e)).appendTo($ul);
diff --git a/src/_h5ai/public/js/lib/globals.js b/src/_h5ai/public/js/lib/globals.js
index 3bab7b36..bf00ab96 100644
--- a/src/_h5ai/public/js/lib/globals.js
+++ b/src/_h5ai/public/js/lib/globals.js
@@ -8,7 +8,6 @@ const publish = (id, name) => {
 };
 
 publish('window', 'win');
-publish('_', 'lo');
 publish('jQuery', 'jq');
 publish('kjua', 'kjua');
 publish('marked', 'marked');
diff --git a/src/_h5ai/public/js/lib/lo.js b/src/_h5ai/public/js/lib/lo.js
index 7d396723..efd1bf23 100644
--- a/src/_h5ai/public/js/lib/lo.js
+++ b/src/_h5ai/public/js/lib/lo.js
@@ -16,6 +16,7 @@ const each = (obj, fn) => keys(obj).forEach(key => fn(obj[key], key));
 const filter = (obj, fn) => values(obj).filter(fn);
 const map = (obj, fn) => values(obj).map(fn);
 const includes = (obj, x) => values(obj).indexOf(x) >= 0;
+const compact = obj => filter(obj, x => !!x);
 const difference = (obj1, obj2) => {
     obj2 = values(obj2);
     return filter(obj1, x => obj2.indexOf(x) < 0);
@@ -33,6 +34,13 @@ const sortBy = (obj, sel) => {
     };
     return values(obj).sort(cmpFn);
 };
+const debounce = (fn, delay) => {
+    let id = null;
+    return () => {
+        clearTimeout(id);
+        id = setTimeout(fn, delay);
+    };
+};
 
 module.exports = {
     isStr,
@@ -44,7 +52,9 @@ module.exports = {
     filter,
     map,
     includes,
+    compact,
     difference,
     intersection,
-    sortBy
+    sortBy,
+    debounce
 };
diff --git a/src/_h5ai/public/js/vendor/lodash-4.13.1.min.js b/src/_h5ai/public/js/vendor/lodash-4.13.1.min.js
deleted file mode 100644
index 93abe817..00000000
--- a/src/_h5ai/public/js/vendor/lodash-4.13.1.min.js
+++ /dev/null
@@ -1,46 +0,0 @@
-/**
- * @license
- * lodash (Custom Build) /license | Underscore.js 1.8.3 underscorejs.org/LICENSE
- * Build: `lodash exports="global" include="compact,debounce,difference,each,extend,filter,includes,indexOf,intersection,isFunction,isNumber,isString,keys,map,sortBy,trim,values,without"`
- */
-;(function(){function t(t,e){return t.set(e[0],e[1]),t}function e(t,e){return t.add(e),t}function r(t,e,r){switch(r.length){case 0:return t.call(e);case 1:return t.call(e,r[0]);case 2:return t.call(e,r[0],r[1]);case 3:return t.call(e,r[0],r[1],r[2])}return t.apply(e,r)}function n(t,e){for(var r=-1,n=t?t.length:0;++r<n&&false!==e(t[r],r,t););return t}function u(t,e){for(var r=-1,n=t?t.length:0,u=0,o=[];++r<n;){var c=t[r];e(c,r,t)&&(o[u++]=c)}return o}function o(t,e){return!(!t||!t.length)&&-1<l(t,e,0);
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