diff --git a/.eslintrc.json b/.eslintrc.json
index b7ed0164..018e23b4 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -82,6 +82,12 @@
         "no-unsanitized/property": "error"
     },
     "overrides": [
+        {
+            "files": ["ext/mixed/js/core.js"],
+            "env": {
+                "webextensions": false
+            }
+        },
         {
             "files": ["ext/**/*.js"],
             "excludedFiles": ["ext/mixed/js/core.js"],
@@ -101,8 +107,7 @@
                 "deferPromise": "readonly",
                 "clone": "readonly",
                 "EventDispatcher": "readonly",
-                "EventListenerCollection": "readonly",
-                "EXTENSION_IS_BROWSER_EDGE": "readonly"
+                "EventListenerCollection": "readonly"
             }
         },
         {
@@ -116,7 +121,7 @@
             }
         },
         {
-            "files": ["ext/mixed/js/core.js"],
+            "files": ["ext/mixed/js/yomichan.js"],
             "globals": {
                 "chrome": "writable"
             }
diff --git a/ext/bg/css/settings.css b/ext/bg/css/settings.css
index 7659f6f2..1b945310 100644
--- a/ext/bg/css/settings.css
+++ b/ext/bg/css/settings.css
@@ -208,6 +208,7 @@ input[type=checkbox].storage-button-checkbox {
 }
 
 html:root[data-browser=edge] [data-show-for-browser~=edge],
+html:root[data-browser=edge-legacy] [data-show-for-browser~=edge-legacy],
 html:root[data-browser=chrome] [data-show-for-browser~=chrome],
 html:root[data-browser=firefox] [data-show-for-browser~=firefox],
 html:root[data-browser=firefox-mobile] [data-show-for-browser~=firefox-mobile],
@@ -221,6 +222,7 @@ html:root[data-operating-system=openbsd] [data-show-for-operating-system~=openbs
 }
 
 html:root[data-browser=edge] [data-hide-for-browser~=edge],
+html:root[data-browser=edge-legacy] [data-hide-for-browser~=edge-legacy],
 html:root[data-browser=chrome] [data-hide-for-browser~=chrome],
 html:root[data-browser=firefox] [data-hide-for-browser~=firefox],
 html:root[data-browser=firefox-mobile] [data-hide-for-browser~=firefox-mobile],
diff --git a/ext/mixed/js/core.js b/ext/mixed/js/core.js
index 9b3ea3e2..e22be33d 100644
--- a/ext/mixed/js/core.js
+++ b/ext/mixed/js/core.js
@@ -15,38 +15,6 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-
-/*
- * Extension information
- */
-
-function _extensionHasChrome() {
-    try {
-        return typeof chrome === 'object' && chrome !== null;
-    } catch (e) {
-        return false;
-    }
-}
-
-function _extensionHasBrowser() {
-    try {
-        return typeof browser === 'object' && browser !== null;
-    } catch (e) {
-        return false;
-    }
-}
-
-const EXTENSION_IS_BROWSER_EDGE = (
-    _extensionHasBrowser() &&
-    (!_extensionHasChrome() || (typeof chrome.runtime === 'undefined' && typeof browser.runtime !== 'undefined'))
-);
-
-if (EXTENSION_IS_BROWSER_EDGE) {
-    // Edge does not have chrome defined.
-    chrome = browser;
-}
-
-
 /*
  * Error handling
  */
diff --git a/ext/mixed/js/environment.js b/ext/mixed/js/environment.js
index 5bd84010..1f4038d2 100644
--- a/ext/mixed/js/environment.js
+++ b/ext/mixed/js/environment.js
@@ -67,8 +67,15 @@ class Environment {
     }
 
     async _getBrowser() {
-        if (EXTENSION_IS_BROWSER_EDGE) {
-            return 'edge';
+        try {
+            if (chrome.runtime.getURL('/').startsWith('ms-browser-extension://')) {
+                return 'edge-legacy';
+            }
+            if (/\bEdge?\//.test(navigator.userAgent)) {
+                return 'edge';
+            }
+        } catch (e) {
+            // NOP
         }
         if (typeof browser !== 'undefined') {
             try {
diff --git a/ext/mixed/js/yomichan.js b/ext/mixed/js/yomichan.js
index 5fa504ef..ab1afcd9 100644
--- a/ext/mixed/js/yomichan.js
+++ b/ext/mixed/js/yomichan.js
@@ -15,6 +15,25 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+// Set up chrome alias if it's not available (Edge Legacy)
+if ((() => {
+    let hasChrome = false;
+    let hasBrowser = false;
+    try {
+        hasChrome = (typeof chrome === 'object' && chrome !== null && typeof chrome.runtime !== 'undefined');
+    } catch (e) {
+        // NOP
+    }
+    try {
+        hasBrowser = (typeof browser === 'object' && browser !== null && typeof browser.runtime !== 'undefined');
+    } catch (e) {
+        // NOP
+    }
+    return (hasBrowser && !hasChrome);
+})()) {
+    chrome = browser;
+}
+
 const yomichan = (() => {
     class Yomichan extends EventDispatcher {
         constructor() {