diff --git a/background/background.js b/background/background.js
index 62a08400..6d6ea071 100644
--- a/background/background.js
+++ b/background/background.js
@@ -217,7 +217,7 @@ function createContextMenus(ids) {
 
 if (chrome.contextMenus) {
   // circumvent the bug with disabling check marks in Chrome 62-64
-  const toggleCheckmark = CHROME >= 3172 && CHROME <= 3288 ?
+  const toggleCheckmark = CHROME >= 62 && CHROME <= 64 ?
     (id => chrome.contextMenus.remove(id, () => createContextMenus([id]) + ignoreChromeError())) :
     ((id, checked) => chrome.contextMenus.update(id, {checked}, ignoreChromeError));
 
diff --git a/background/icon-manager.js b/background/icon-manager.js
index 7319b32e..0ea14d03 100644
--- a/background/icon-manager.js
+++ b/background/icon-manager.js
@@ -3,7 +3,7 @@
 'use strict';
 
 const iconManager = (() => {
-  const ICON_SIZES = FIREFOX || CHROME >= 2883 && !VIVALDI ? [16, 32] : [19, 38];
+  const ICON_SIZES = FIREFOX || CHROME >= 55 && !VIVALDI ? [16, 32] : [19, 38];
   const staleBadges = new Set();
 
   prefs.subscribe([
diff --git a/js/messaging.js b/js/messaging.js
index cb8454e5..82f009a5 100644
--- a/js/messaging.js
+++ b/js/messaging.js
@@ -4,15 +4,13 @@
 /* global promisify */
 'use strict';
 
-const CHROME = Boolean(chrome.app) && parseInt(navigator.userAgent.match(/Chrom\w+\/(?:\d+\.){2}(\d+)|$/)[1]);
+const CHROME = Boolean(chrome.app) && parseInt(navigator.userAgent.match(/Chrom\w+\/(\d+)|$/)[1]);
 const OPERA = Boolean(chrome.app) && parseFloat(navigator.userAgent.match(/\bOPR\/(\d+\.\d+)|$/)[1]);
 const VIVALDI = Boolean(chrome.app) && navigator.userAgent.includes('Vivaldi');
-// FIXME: who use this?
-// const ANDROID = !chrome.windows;
 let FIREFOX = !chrome.app && parseFloat(navigator.userAgent.match(/\bFirefox\/(\d+\.\d+)|$/)[1]);
 
 // see PR #781
-const CHROME_HAS_BORDER_BUG = CHROME >= 3167 && CHROME <= 3704;
+const CHROME_HAS_BORDER_BUG = CHROME >= 62 && CHROME <= 74;
 
 if (!CHROME && !chrome.browserAction.openPopup) {
   // in FF pre-57 legacy addons can override useragent so we assume the worst
@@ -62,7 +60,7 @@ const URLS = {
 
   // Chrome 61.0.3161+ doesn't run content scripts on NTP https://crrev.com/2978953002/
   // TODO: remove when "minimum_chrome_version": "61" or higher
-  chromeProtectsNTP: CHROME >= 3161,
+  chromeProtectsNTP: CHROME >= 61,
 
   userstylesOrgJson: 'https://userstyles.org/styles/chrome/',
 
diff --git a/manage/manage.js b/manage/manage.js
index e79d3ad8..bbec8d5b 100644
--- a/manage/manage.js
+++ b/manage/manage.js
@@ -625,7 +625,7 @@ function switchUI({styleOnly} = {}) {
       filter: none;
       opacity: 1;
     }
-  `) + (CHROME >= 3004 ? `
+  `) + (CHROME >= 58 ? `
     .newUI .entry {
       contain: strict;
     }
diff --git a/options/options.js b/options/options.js
index 817dfcef..0d99be13 100644
--- a/options/options.js
+++ b/options/options.js
@@ -10,7 +10,7 @@ enforceInputRange($('#popupWidth'));
 setTimeout(splitLongTooltips);
 
 // https://github.com/openstyles/stylus/issues/822
-if (!FIREFOX && CHROME >= 3809 && CHROME < 4044) {
+if (!FIREFOX && CHROME >= 76 && CHROME <= 81) {
   const dropboxOption = $('option[value="dropbox"]');
   dropboxOption.disabled = true;
   dropboxOption.setAttribute('title', t('hostDisabled'));
@@ -24,7 +24,7 @@ if (CHROME_HAS_BORDER_BUG) {
 }
 
 // collapse #advanced block in Chrome pre-66 (classic chrome://extensions UI)
-if (!FIREFOX && !OPERA && CHROME < 3343) {
+if (!FIREFOX && !OPERA && CHROME < 66) {
   const block = $('#advanced');
   $('h1', block).onclick = event => {
     event.preventDefault();
diff --git a/popup/popup.js b/popup/popup.js
index 7ec2f28b..f6aea8c9 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -15,7 +15,7 @@ const ABOUT_BLANK = 'about:blank';
 const ENTRY_ID_PREFIX_RAW = 'style-';
 const ENTRY_ID_PREFIX = '#' + ENTRY_ID_PREFIX_RAW;
 
-if (CHROME >= 3345 && CHROME < 3533) { // Chrome 66-69 adds a gap, https://crbug.com/821143
+if (CHROME >= 66 && CHROME <= 69) { // Chrome 66-69 adds a gap, https://crbug.com/821143
   document.head.appendChild($create('style', 'html { overflow: overlay }'));
 }