diff --git a/background/background.js b/background/background.js
index 47261b53..2a76f8ed 100644
--- a/background/background.js
+++ b/background/background.js
@@ -30,14 +30,21 @@ chrome.runtime.onMessage.addListener(onRuntimeMessage);
     listener('styleReplaceAll', data));
 }
 
-chrome.contextMenus.onClicked.addListener((info, tab) =>
-  contextMenus[info.menuItemId].click(info, tab));
+if (chrome.contextMenus) {
+  chrome.contextMenus.onClicked.addListener((info, tab) =>
+    contextMenus[info.menuItemId].click(info, tab));
+}
 
-if ('commands' in chrome) {
+if (chrome.commands) {
   // Not available in Firefox - https://bugzilla.mozilla.org/show_bug.cgi?id=1240350
   chrome.commands.onCommand.addListener(command => browserCommands[command]());
 }
 
+if (!chrome.browserAction ||
+    !['setIcon', 'setBadgeBackgroundColor', 'setBadgeText'].every(name => chrome.browserAction[name])) {
+  window.updateIcon = () => {};
+}
+
 // *************************************************************************
 // set the default icon displayed after a tab is created until webNavigation kicks in
 prefs.subscribe(['iconset'], () => updateIcon({id: undefined}, {}));
@@ -108,7 +115,7 @@ contextMenus = Object.assign({
   }
 });
 
-{
+if (chrome.contextMenus) {
   const createContextMenus = (ids = Object.keys(contextMenus)) => {
     for (const id of ids) {
       const item = Object.assign({id}, contextMenus[id]);
diff --git a/edit.html b/edit.html
index 36393b74..c13e3c75 100644
--- a/edit.html
+++ b/edit.html
@@ -1,6 +1,7 @@
 <html id="stylus">
   <head>
-    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
     <style id="firefox-transitions-bug-suppressor">
       /* restrict to FF */
diff --git a/edit/edit.js b/edit/edit.js
index 6d43fafa..79397945 100644
--- a/edit/edit.js
+++ b/edit/edit.js
@@ -505,7 +505,7 @@ document.addEventListener('wheel', event => {
   }
 });
 
-queryTabs({currentWindow: true}).then(tabs => {
+chrome.windows && queryTabs({currentWindow: true}).then(tabs => {
   const windowId = tabs[0].windowId;
   if (prefs.get('openEditInWindow')) {
     if (
@@ -532,6 +532,9 @@ queryTabs({currentWindow: true}).then(tabs => {
 getOwnTab().then(tab => {
   const ownTabId = tab.id;
   useHistoryBack = sessionStorageHash('manageStylesHistory').value[ownTabId] === location.href;
+  if (!chrome.windows) {
+    return;
+  }
   // When an edit page gets attached or detached, remember its state
   // so we can do the same to the next one to open.
   chrome.tabs.onAttached.addListener((tabId, info) => {
@@ -1500,7 +1503,7 @@ function initHooks() {
 
 
 function toggleContextMenuDelete(event) {
-  if (event.button === 2 && prefs.get('editor.contextDelete')) {
+  if (chrome.contextMenus && event.button === 2 && prefs.get('editor.contextDelete')) {
     chrome.contextMenus.update('editor.contextDelete', {
       enabled: Boolean(
         this.selectionStart !== this.selectionEnd ||
diff --git a/js/dom.js b/js/dom.js
index dbdcbae9..aeb1bb95 100644
--- a/js/dom.js
+++ b/js/dom.js
@@ -47,7 +47,7 @@ onDOMready().then(() => {
   }
 });
 
-if (!chrome.app) {
+if (!chrome.app && chrome.windows) {
   // die if unable to access BG directly
   chrome.windows.getCurrent(wnd => {
     if (!BG && wnd.incognito) {
diff --git a/js/messaging.js b/js/messaging.js
index c16a149f..cc1d56e1 100644
--- a/js/messaging.js
+++ b/js/messaging.js
@@ -7,6 +7,7 @@ const KEEP_CHANNEL_OPEN = true;
 
 const CHROME = Boolean(chrome.app) && parseInt(navigator.userAgent.match(/Chrom\w+\/(?:\d+\.){2}(\d+)|$/)[1]);
 const OPERA = CHROME && parseFloat(navigator.userAgent.match(/\bOPR\/(\d+\.\d+)|$/)[1]);
+const ANDROID = !chrome.windows;
 let FIREFOX = !CHROME && parseFloat(navigator.userAgent.match(/\bFirefox\/(\d+\.\d+)|$/)[1]);
 
 if (!CHROME && !chrome.browserAction.openPopup) {
@@ -204,7 +205,8 @@ function openURL({url, index, openerTabId, currentWindow = true}) {
         } else {
           // create a new tab
           const options = {url, index};
-          if (tab && (!FIREFOX || FIREFOX >= 57) && !chromeInIncognito) {
+          // FF57+ supports openerTabId, but not in Android (indicated by the absence of chrome.windows)
+          if (tab && (!FIREFOX || FIREFOX >= 57 && chrome.windows) && !chromeInIncognito) {
             options.openerTabId = tab.id;
           }
           chrome.tabs.create(options, resolve);
@@ -220,7 +222,7 @@ function activateTab(tab) {
     new Promise(resolve => {
       chrome.tabs.update(tab.id, {active: true}, resolve);
     }),
-    new Promise(resolve => {
+    chrome.windows && new Promise(resolve => {
       chrome.windows.update(tab.windowId, {focused: true}, resolve);
     }),
   ]);
@@ -438,7 +440,7 @@ function openEditor(id) {
   if (id) {
     url += `?id=${id}`;
   }
-  if (prefs.get('openEditInWindow')) {
+  if (chrome.windows && prefs.get('openEditInWindow')) {
     chrome.windows.create(Object.assign({url}, prefs.get('windowPosition')));
   } else {
     openURL({url});
diff --git a/js/prefs.js b/js/prefs.js
index c9d6c728..a0238e92 100644
--- a/js/prefs.js
+++ b/js/prefs.js
@@ -23,7 +23,8 @@ var prefs = new function Prefs() {
     'manage.onlyEnabled.invert': false, // display only disabled styles
     'manage.onlyLocal.invert': false,   // display only externally installed styles
     'manage.onlyUsercss.invert': false, // display only non-usercss (standard) styles
-    'manage.newUI': true,           // use the new compact layout
+    // the new compact layout doesn't look good on Android yet
+    'manage.newUI': !navigator.appVersion.includes('Android'),
     '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
diff --git a/manage.html b/manage.html
index ac39a29b..0250eb7d 100644
--- a/manage.html
+++ b/manage.html
@@ -1,7 +1,8 @@
 <html id="stylus">
 
 <head>
-  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title i18n-text="manageTitle"></title>
   <link rel="stylesheet" href="manage/manage.css">
   <link rel="stylesheet" href="msgbox/msgbox.css">
diff --git a/manage/manage.js b/manage/manage.js
index f4df30d4..8bbdb5cf 100644
--- a/manage/manage.js
+++ b/manage/manage.js
@@ -333,7 +333,7 @@ Object.assign(handleEvent, {
     const openForegroundTab = (middle && shift) || (left && ctrl && shift);
     const url = event.target.closest('[href]').href;
     if (openWindow || openBackgroundTab || openForegroundTab) {
-      if (openWindow) {
+      if (chrome.windows && openWindow) {
         chrome.windows.create(Object.assign(prefs.get('windowPosition'), {url}));
       } else {
         openURL({url, active: openForegroundTab});
diff --git a/options.html b/options.html
index 8c255813..433c81c6 100644
--- a/options.html
+++ b/options.html
@@ -1,7 +1,8 @@
 <!DOCTYPE html>
 <html id="stylus">
 <head>
-  <meta charset="utf-8">
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title i18n-text-append="optionsHeading">Stylus </title>
   <link rel="stylesheet" href="options/options.css">
   <link rel="stylesheet" href="options/onoffswitch.css">
diff --git a/popup.html b/popup.html
index fb0899eb..095e4b97 100644
--- a/popup.html
+++ b/popup.html
@@ -1,7 +1,8 @@
 <html id="stylus">
 
 <head>
-  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <link rel="stylesheet" href="popup/popup.css">
 
   <style id="firefox-transitions-bug-suppressor">
diff --git a/popup/popup.js b/popup/popup.js
index eff7f6db..fc9f0ef1 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -354,7 +354,7 @@ Object.assign(handleEvent, {
   },
 
   openLink(event) {
-    if (!prefs.get('openEditInWindow', false)) {
+    if (!chrome.windows || !prefs.get('openEditInWindow', false)) {
       handleEvent.openURLandHide.call(this, event);
       return;
     }
