diff --git a/background/background.js b/background/background.js
index c8481c9c..7c9168c9 100644
--- a/background/background.js
+++ b/background/background.js
@@ -10,6 +10,7 @@
 /* global uswApi */
 /* global
   FIREFOX
+  UA
   URLS
   activateTab
   download
@@ -177,6 +178,10 @@ if (chrome.commands) {
 }
 
 chrome.runtime.onInstalled.addListener(({reason, previousVersion}) => {
+  if (reason === 'install') {
+    if (UA.mobile) prefs.set('manage.newUI', false);
+    if (UA.windows) prefs.set('editor.keyMap', 'sublime');
+  }
   if (reason === 'update') {
     const [a, b, c] = (previousVersion || '').split('.');
     if (a <= 1 && b <= 5 && c <= 13) { // 1.5.13
diff --git a/background/context-menus.js b/background/context-menus.js
index 53101dea..e0c50143 100644
--- a/background/context-menus.js
+++ b/background/context-menus.js
@@ -41,11 +41,7 @@
   };
 
   // "Delete" item in context menu for browsers that don't have it
-  if (CHROME &&
-      // looking at the end of UA string
-      /(Vivaldi|Safari)\/[\d.]+$/.test(navigator.userAgent) &&
-      // skip forks with Flash as those are likely to have the menu e.g. CentBrowser
-      !Array.from(navigator.plugins).some(p => p.name === 'Shockwave Flash')) {
+  if (CHROME) {
     prefs.__defaults['editor.contextDelete'] = true;
   }
 
diff --git a/background/icon-manager.js b/background/icon-manager.js
index ae255518..9b8d1f2d 100644
--- a/background/icon-manager.js
+++ b/background/icon-manager.js
@@ -2,17 +2,17 @@
 /* global addAPI bgReady */// common.js
 /* global prefs */
 /* global tabMan */
-/* global CHROME FIREFOX VIVALDI debounce ignoreChromeError */// toolbox.js
+/* global CHROME FIREFOX UA debounce ignoreChromeError */// toolbox.js
 'use strict';
 
 /* exported iconMan */
 const iconMan = (() => {
-  const ICON_SIZES = FIREFOX || CHROME >= 55 && !VIVALDI ? [16, 32] : [19, 38];
+  const ICON_SIZES = FIREFOX || CHROME && !UA.vivaldi ? [16, 32] : [19, 38];
   const staleBadges = new Set();
   const imageDataCache = new Map();
   const badgeOvr = {color: '', text: ''};
   // https://github.com/openstyles/stylus/issues/1287 Fenix can't use custom ImageData
-  const FIREFOX_ANDROID = FIREFOX && navigator.userAgent.includes('Android');
+  const FIREFOX_ANDROID = FIREFOX && UA.mobile;
 
   // https://github.com/openstyles/stylus/issues/335
   let hasCanvas = FIREFOX_ANDROID ? false : loadImage(`/images/icon/${ICON_SIZES[0]}.png`)
diff --git a/edit/codemirror-default.js b/edit/codemirror-default.js
index 22523dcb..9ddef5ba 100644
--- a/edit/codemirror-default.js
+++ b/edit/codemirror-default.js
@@ -1,5 +1,6 @@
 /* global $ */// dom.js
 /* global CodeMirror */
+/* global UA */// toolbox.js
 /* global editor */
 /* global prefs */
 /* global t */// localization.js
@@ -62,7 +63,7 @@
     if (!extras.includes('blockComment')) {
       KM.sublime['Shift-Ctrl-/'] = 'commentSelection';
     }
-    if (navigator.appVersion.includes('Windows')) {
+    if (UA.windows) {
       // 'pcDefault' keymap on Windows should have F3/Shift-F3/Ctrl-R
       if (!extras.includes('findNext')) KM.pcDefault['F3'] = 'findNext';
       if (!extras.includes('findPrev')) KM.pcDefault['Shift-F3'] = 'findPrev';
diff --git a/js/dom.js b/js/dom.js
index 9d7671b5..155deae6 100644
--- a/js/dom.js
+++ b/js/dom.js
@@ -1,4 +1,4 @@
-/* global FIREFOX */// toolbox.js
+/* global FIREFOX UA */// toolbox.js
 /* global prefs */
 'use strict';
 
@@ -468,9 +468,7 @@ const dom = {};
     '/js/dom-on-load',
   ];
   const elHtml = document.documentElement;
-  if (!/^Win\d+/.test(navigator.platform)) {
-    elHtml.classList.add('non-windows');
-  }
+  if (!UA.windows) elHtml.classList.add('non-windows');
   // set language for a) CSS :lang pseudo and b) hyphenation
   elHtml.setAttribute('lang', chrome.i18n.getUILanguage());
   // set up header width resizer
diff --git a/js/prefs.js b/js/prefs.js
index cceae0a3..5a33f9bf 100644
--- a/js/prefs.js
+++ b/js/prefs.js
@@ -56,7 +56,7 @@
     'manage.backup.expanded': true,
     'manage.filters.expanded': true,
     // the new compact layout doesn't look good on Android yet
-    'manage.newUI': !navigator.appVersion.includes('Android'),
+    'manage.newUI': true,
     'manage.newUI.favicons': false, // show favicons for the sites in applies-to
     'manage.newUI.faviconsGray': true, // gray out favicons
     'manage.newUI.targets': 3,      // max number of applies-to targets visible: 0 = none
@@ -71,7 +71,7 @@
     'editor.smartIndent': true,     // 'smart' indent
     'editor.indentWithTabs': false, // smart indent with tabs
     'editor.tabSize': 4,            // tab width, in spaces
-    'editor.keyMap': navigator.appVersion.indexOf('Windows') > 0 ? 'sublime' : 'default',
+    'editor.keyMap': 'default',
     'editor.theme': 'default',      // CSS theme
     // CSS beautifier
     'editor.beautify': {
diff --git a/js/toolbox.js b/js/toolbox.js
index 55bf3f46..336f9c71 100644
--- a/js/toolbox.js
+++ b/js/toolbox.js
@@ -3,6 +3,7 @@
 /* exported
   CHROME_POPUP_BORDER_BUG
   RX_META
+  UA
   capitalize
   clamp
   closeCurrentTab
@@ -23,10 +24,23 @@
   waitForTabUrl
 */
 
-const CHROME = Boolean(chrome.app) && Number(navigator.userAgent.match(/Chrom\w+\/(\d+)|$/)[1]);
-const OPERA = Boolean(chrome.app) && parseFloat(navigator.userAgent.match(/\bOPR\/(\d+\.\d+)|$/)[1]);
-const VIVALDI = Boolean(chrome.app) && navigator.userAgent.includes('Vivaldi');
-let FIREFOX = !chrome.app && parseFloat(navigator.userAgent.match(/\bFirefox\/(\d+\.\d+)|$/)[1]);
+let FIREFOX;
+const [CHROME, UA] = (() => {
+  const uad = navigator.userAgentData;
+  const ua = uad || navigator.userAgent;
+  const brands = uad ? uad.brands.map(_ => `${_.brand}/${_.version}`).join(' ') : ua;
+  const getVer = name => Number(brands.match(new RegExp(name + '\\w*/(\\d+)|$'))[1]) || false;
+  FIREFOX = !chrome.app && getVer('Firefox');
+  return [
+    getVer('Chrom'),
+    {
+      mobile: uad ? uad.mobile : /Android/.test(ua),
+      windows: /Windows/.test(uad ? uad.platform : ua),
+      opera: getVer('(Opera|OPR)'),
+      vivaldi: getVer('Vivaldi'),
+    },
+  ];
+})();
 
 // see PR #781
 const CHROME_POPUP_BORDER_BUG = CHROME >= 62 && CHROME <= 74;
@@ -47,7 +61,7 @@ const URLS = {
   ownOrigin: chrome.runtime.getURL(''),
 
   configureCommands:
-    OPERA ? 'opera://settings/configureCommands'
+    UA.opera ? 'opera://settings/configureCommands'
           : 'chrome://extensions/configureCommands',
 
   installUsercss: chrome.runtime.getURL('install-usercss.html'),
@@ -56,7 +70,7 @@ const URLS = {
   // https://cs.chromium.org/chromium/src/chrome/common/extensions/chrome_extensions_client.cc
   browserWebStore:
     FIREFOX ? 'https://addons.mozilla.org/' :
-    OPERA ? 'https://addons.opera.com/' :
+    UA.opera ? 'https://addons.opera.com/' :
       'https://chrome.google.com/webstore/',
 
   emptyTab: [
@@ -124,11 +138,11 @@ const URLS = {
 
 const RX_META = /\/\*!?\s*==userstyle==[\s\S]*?==\/userstyle==\s*\*\//i;
 
-if (FIREFOX || OPERA || VIVALDI) {
+if (FIREFOX || UA.opera || UA.vivaldi) {
   document.documentElement.classList.add(
     FIREFOX && 'firefox' ||
-    OPERA && 'opera' ||
-    VIVALDI && 'vivaldi');
+    UA.opera && 'opera' ||
+    UA.vivaldi && 'vivaldi');
 }
 
 // FF57+ supports openerTabId, but not in Android
diff --git a/manage/manage.js b/manage/manage.js
index bb171d09..c8621d36 100644
--- a/manage/manage.js
+++ b/manage/manage.js
@@ -1,5 +1,5 @@
 /* global API msg */// msg.js
-/* global CHROME VIVALDI debounce */// toolbox.js
+/* global CHROME UA debounce */// toolbox.js
 /* global Events handleBulkChange handleVisibilityChange */// events.js
 /* global fitSelectBoxesIn switchUI showStyles */// render.js
 /* global prefs */
@@ -78,7 +78,7 @@ newUI.renderClass();
     ].map(id => `--${id}:"${CSS.escape(t(id))}";`).join('')
     }}`);
 
-  if (!VIVALDI) {
+  if (!UA.vivaldi) {
     waitForSheet().then(() => {
       fitSelectBoxesIn($('#filters'));
     });
diff --git a/options/options.js b/options/options.js
index 1590fa32..0fd6894e 100644
--- a/options/options.js
+++ b/options/options.js
@@ -14,7 +14,7 @@
   CHROME
   CHROME_POPUP_BORDER_BUG
   FIREFOX
-  OPERA
+  UA
   URLS
   capitalize
   clamp
@@ -34,7 +34,7 @@ if (CHROME_POPUP_BORDER_BUG) {
 }
 
 // collapse #advanced block in Chrome pre-66 (classic chrome://extensions UI)
-if (!FIREFOX && !OPERA && CHROME < 66) {
+if (!FIREFOX && !UA.opera && CHROME < 66) {
   const block = $('#advanced');
   $('h1', block).onclick = event => {
     event.preventDefault();