diff --git a/CHANGES.md b/CHANGES.md
index 5838f26af..a528f8537 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -46,6 +46,15 @@
 
 ### Breaking Changes
 
+The default persistent store, set via the [persistent_store](https://conversejs.org/docs/html/configuration.html#persistent-store),
+is now IndexedDB. This main advantage of using IndexedDB is that it doesn't
+have a fixed size limit. We don't provide a tool to migrate data from
+localStorage to IndexedDB. For almost all data this is not a problem since
+the data can be fetched again from the XMPP server. However,
+decrypted OMEMO messages cannot be fetched again from the server, since the
+double ratchet makes it impossible to again decrypt them. This means your
+decrypted OMEMO history will be lost in the transition.
+
 The [afterMessageBodyTransformed](https://conversejs.org/docs/html/api/-_converse.html#event:afterMessageBodyTransformed) and [beforeMessageBodyTransformed](https://conversejs.org/docs/html/api/-_converse.html#event:beforeMessageBodyTransformed) events now has a different signatures.
 When leaving a MUC, the message history is deleted. This means that decrypted
 OMEMO messages are gone and cannot be recovered on that device. See [muc_clear_messages_on_leave](https://conversejs.org/docs/html/configuration.html#muc-clear-messages-on-leave).
diff --git a/dev.html b/dev.html
index b22678c72..1dcc16fc6 100644
--- a/dev.html
+++ b/dev.html
@@ -16,7 +16,7 @@
     <script src="dist/converse.js"></script>
 </head>
 
-<body class="reset" style="background-color: #211018;">
+<body class="reset" style="background-color: var(--global-background-color)">
 <div id="conversejs-bg"></div>
 <script>
 
@@ -36,9 +36,8 @@
         muc_respect_autojoin: true,
         muc_show_logs_before_join: true,
         notify_all_room_messages: ['discuss@conference.conversejs.org'],
-        persistent_store: 'IndexedDB',
-        // theme: 'concord',
-        // view_mode: 'fullscreen',
+        theme: 'concord',
+        view_mode: 'fullscreen',
         websocket_url: 'wss://conversejs.org/xmpp-websocket',
         // websocket_url: 'ws://chat.example.org:5380/xmpp-websocket',
         whitelisted_plugins: ['converse-debug'],
diff --git a/src/headless/shared/settings.js b/src/headless/shared/settings.js
index 64f2ffd18..33e5ee813 100644
--- a/src/headless/shared/settings.js
+++ b/src/headless/shared/settings.js
@@ -39,7 +39,7 @@ export const DEFAULT_SETTINGS = {
     ],
     nickname: undefined,
     password: undefined,
-    persistent_store: 'localStorage',
+    persistent_store: 'IndexedDB',
     rid: undefined,
     root: window.document,
     sid: undefined,
diff --git a/src/shared/tests/mock.js b/src/shared/tests/mock.js
index e2275e6ee..ead760b11 100644
--- a/src/shared/tests/mock.js
+++ b/src/shared/tests/mock.js
@@ -622,7 +622,7 @@ async function _initConverse (settings) {
         'discover_connection_methods': false,
         'enable_smacks': false,
         'i18n': 'en',
-        // 'persistent_store': 'IndexedDB',
+        'persistent_store': 'localStorage',
         'loglevel': 'warn',
         'no_trimming': true,
         'play_sounds': false,
