diff --git a/package-lock.json b/package-lock.json
index 192f46a8..91239834 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -25,6 +25,7 @@
         "html-prettify": "~1.0.7",
         "idb-keyval": "~6.2.1",
         "intl-locale-textinfo-polyfill": "~2.1.1",
+        "js-cookie": "~3.0.5",
         "just-debounce-it": "~3.2.0",
         "lz-string": "~1.5.0",
         "masto": "~6.8.0",
@@ -7472,6 +7473,14 @@
         "jiti": "bin/jiti.js"
       }
     },
+    "node_modules/js-cookie": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/js-cookie/-/js-cookie-3.0.5.tgz",
+      "integrity": "sha512-cEiJEAEoIbWfCZYKWhVwFuvPX1gETRYPw6LlaTKoxD3s2AkXzkCjnp6h0V77ozyqj0jakteJ4YqDJT830+lVGw==",
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/js-sha256": {
       "version": "0.10.1",
       "resolved": "https://registry.npmjs.org/js-sha256/-/js-sha256-0.10.1.tgz",
diff --git a/package.json b/package.json
index 0afab5dd..52c96793 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "html-prettify": "~1.0.7",
     "idb-keyval": "~6.2.1",
     "intl-locale-textinfo-polyfill": "~2.1.1",
+    "js-cookie": "~3.0.5",
     "just-debounce-it": "~3.2.0",
     "lz-string": "~1.5.0",
     "masto": "~6.8.0",
diff --git a/src/app.jsx b/src/app.jsx
index 606b9d0c..bf18e23a 100644
--- a/src/app.jsx
+++ b/src/app.jsx
@@ -321,9 +321,9 @@ function App() {
         window.location.pathname || '/',
       );
 
-      const clientID = store.session.get('clientID');
-      const clientSecret = store.session.get('clientSecret');
-      const vapidKey = store.session.get('vapidKey');
+      const clientID = store.sessionCookie.get('clientID');
+      const clientSecret = store.sessionCookie.get('clientSecret');
+      const vapidKey = store.sessionCookie.get('vapidKey');
 
       (async () => {
         setUIState('loading');
diff --git a/src/pages/login.jsx b/src/pages/login.jsx
index 8956385c..21d52bd4 100644
--- a/src/pages/login.jsx
+++ b/src/pages/login.jsx
@@ -64,9 +64,9 @@ function Login() {
           });
 
         if (client_id && client_secret) {
-          store.session.set('clientID', client_id);
-          store.session.set('clientSecret', client_secret);
-          store.session.set('vapidKey', vapid_key);
+          store.sessionCookie.set('clientID', client_id);
+          store.sessionCookie.set('clientSecret', client_secret);
+          store.sessionCookie.set('vapidKey', vapid_key);
 
           location.href = await getAuthorizationURL({
             instanceURL,
diff --git a/src/utils/store.js b/src/utils/store.js
index fb587b11..19309885 100644
--- a/src/utils/store.js
+++ b/src/utils/store.js
@@ -1,5 +1,9 @@
+import Cookies from 'js-cookie';
+
 import { getCurrentAccountNS } from './store-utils';
 
+const cookies = Cookies.withAttributes({ sameSite: 'strict', secure: true });
+
 const local = {
   get: (key) => {
     try {
@@ -86,6 +90,38 @@ const session = {
   },
 };
 
+// Session secure cookie
+const cookie = {
+  get: (key) => cookies.get(key),
+  set: (key, value) => cookies.set(key, value),
+  del: (key) => cookies.remove(key),
+};
+
+// Cookie with sessionStorage fallback
+const sessionCookie = {
+  get: (key) => {
+    if (navigator.cookieEnabled) {
+      return cookie.get(key);
+    } else {
+      return session.get(key);
+    }
+  },
+  set: (key, value) => {
+    if (navigator.cookieEnabled) {
+      return cookie.set(key, value);
+    } else {
+      return session.set(key, value);
+    }
+  },
+  del: (key) => {
+    if (navigator.cookieEnabled) {
+      return cookie.del(key);
+    } else {
+      return session.del(key);
+    }
+  },
+};
+
 // Store with account namespace (id@domain.tld) <- uses id, not username
 const account = {
   get: (key) => {
@@ -118,4 +154,4 @@ const account = {
   },
 };
 
-export default { local, session, account };
+export default { local, session, sessionCookie, cookie, account };