diff --git a/subprojects/extensions-app/data/meson.build b/subprojects/extensions-app/data/meson.build
index 4f24267b0..367c56d28 100644
--- a/subprojects/extensions-app/data/meson.build
+++ b/subprojects/extensions-app/data/meson.build
@@ -48,3 +48,5 @@ configure_file(
 
 subdir('icons')
 subdir('metainfo')
+
+install_data(base_id + '.gschema.xml', install_dir: schemadir)
diff --git a/subprojects/extensions-app/data/org.gnome.Extensions.gschema.xml b/subprojects/extensions-app/data/org.gnome.Extensions.gschema.xml
new file mode 100644
index 000000000..d88bb87a3
--- /dev/null
+++ b/subprojects/extensions-app/data/org.gnome.Extensions.gschema.xml
@@ -0,0 +1,17 @@
+<?<?xml version="1.0" encoding="UTF-8"?>
+<schemalist>
+  <schema path="/org/gnome/Extensions/" id="org.gnome.Extensions">
+    <key name="window-width" type="i">
+      <default>800</default>
+      <summary>Window width</summary>
+    </key>
+    <key name="window-height" type="i">
+      <default>500</default>
+      <summary>Window height</summary>
+    </key>
+    <key name="window-maximized" type="b">
+      <default>false</default>
+      <summary>Window maximized</summary>
+    </key>
+  </schema>
+ </schemalist>
diff --git a/subprojects/extensions-app/data/ui/extensions-window.ui b/subprojects/extensions-app/data/ui/extensions-window.ui
index 51ce6db3f..3e5116d91 100644
--- a/subprojects/extensions-app/data/ui/extensions-window.ui
+++ b/subprojects/extensions-app/data/ui/extensions-window.ui
@@ -54,8 +54,6 @@
     <property name="filter">searchFilter</property>
   </object>
   <template class="ExtensionsWindow" parent="AdwApplicationWindow">
-    <property name="default-width">800</property>
-    <property name="default-height">500</property>
     <property name="title" translatable="yes">Extensions</property>
     <child>
       <object class="AdwToolbarView">
diff --git a/subprojects/extensions-app/js/extensionsWindow.js b/subprojects/extensions-app/js/extensionsWindow.js
index 9b7a1519e..4d9cf17c9 100644
--- a/subprojects/extensions-app/js/extensionsWindow.js
+++ b/subprojects/extensions-app/js/extensionsWindow.js
@@ -59,6 +59,20 @@ export const ExtensionsWindow = GObject.registerClass({
                 },
             }]);
 
+        const settings = new Gio.Settings({
+            schema_id: 'org.gnome.Extensions',
+        });
+
+        settings.bind('window-width',
+            this, 'default-width',
+            Gio.SettingsBindFlags.DEFAULT);
+        settings.bind('window-height',
+            this, 'default-height',
+            Gio.SettingsBindFlags.DEFAULT);
+        settings.bind('window-maximized',
+            this, 'maximized',
+            Gio.SettingsBindFlags.DEFAULT);
+
         this._searchEntry.connect('search-changed',
             () => (this._searchFilter.search = this._searchEntry.text));
         this._searchBar.connect('notify::search-mode-enabled',
diff --git a/subprojects/extensions-app/meson.build b/subprojects/extensions-app/meson.build
index f69b110f8..858aa69a5 100644
--- a/subprojects/extensions-app/meson.build
+++ b/subprojects/extensions-app/meson.build
@@ -44,6 +44,7 @@ desktopdir = join_paths(datadir, 'applications')
 icondir = join_paths(datadir, 'icons')
 localedir = join_paths(datadir, 'locale')
 metainfodir = join_paths(datadir, 'metainfo')
+schemadir = join_paths(datadir, 'glib-2.0', 'schemas')
 servicedir = join_paths(datadir, 'dbus-1', 'services')
 
 gjs = find_program('gjs')
@@ -64,6 +65,7 @@ if not meson.is_subproject()
   subdir('po')
 
   gnome.post_install(
+    glib_compile_schemas: true,
     gtk_update_icon_cache: true
   )