diff --git a/docs/EXTENSIONS.md b/docs/EXTENSIONS.md
index 24b69c46..51e5b5e7 100644
--- a/docs/EXTENSIONS.md
+++ b/docs/EXTENSIONS.md
@@ -58,6 +58,13 @@ applies — installed extension code runs with full session authority — so onl
 install extensions from the vetted gallery or sources you trust as much as the
 WebUI source itself.
 
+Some gallery entries need more than WebUI assets. If an extension declares
+post-install guidance or lifecycle requirements such as a loopback sidecar or a
+native host, Settings -> Extensions shows a **Next step** note on the card after
+install. For example, Desktop Companion can install the WebUI bridge from the
+gallery, but the desktop pet is only visible after the local Desktop Companion
+app is started.
+
 ### Manual / advanced configuration (optional)
 
 `HERMES_WEBUI_EXTENSION_DIR` is **optional** and overrides the managed default.
diff --git a/static/i18n.js b/static/i18n.js
index 08864c9f..e47b779b 100644
--- a/static/i18n.js
+++ b/static/i18n.js
@@ -680,6 +680,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Next step',
+    ext_gallery_after_install: 'After install',
+    ext_gallery_local_component_required: 'This extension has a local component. Start the required local app or sidecar after installing.',
+    ext_gallery_local_app_label: 'Local app',
+    ext_gallery_required_suffix: '{0} required',
+    ext_gallery_sidecar_required: 'Sidecar required',
+    ext_gallery_native_host_required: 'Native host required',
+    ext_gallery_open_setup_guide: 'Open setup guide',
+    ext_gallery_install_restart_required: 'Extension installed. Restart required to apply.',
+    ext_gallery_install_followup: 'Extension installed. See the card for next steps.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',
@@ -2301,6 +2311,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Prossimo passo',
+    ext_gallery_after_install: "Dopo l'installazione",
+    ext_gallery_local_component_required: "Questa estensione ha un componente locale. Avvia l'app locale o il sidecar richiesto dopo l'installazione.",
+    ext_gallery_local_app_label: 'App locale',
+    ext_gallery_required_suffix: '{0} richiesto',
+    ext_gallery_sidecar_required: 'Sidecar richiesto',
+    ext_gallery_native_host_required: 'Host nativo richiesto',
+    ext_gallery_open_setup_guide: 'Apri guida di configurazione',
+    ext_gallery_install_restart_required: 'Estensione installata. Riavvio richiesto per applicare le modifiche.',
+    ext_gallery_install_followup: 'Estensione installata. Consulta la scheda per i prossimi passi.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -3913,6 +3933,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: '次の手順',
+    ext_gallery_after_install: 'インストール後',
+    ext_gallery_local_component_required: 'この拡張機能にはローカルコンポーネントが必要です。インストール後に必要なローカルアプリまたはサイドカーを起動してください。',
+    ext_gallery_local_app_label: 'ローカルアプリ',
+    ext_gallery_required_suffix: '{0} が必要',
+    ext_gallery_sidecar_required: 'サイドカーが必要',
+    ext_gallery_native_host_required: 'ネイティブホストが必要',
+    ext_gallery_open_setup_guide: 'セットアップガイドを開く',
+    ext_gallery_install_restart_required: '拡張機能をインストールしました。適用するには再起動が必要です。',
+    ext_gallery_install_followup: '拡張機能をインストールしました。次の手順はカードで確認してください。',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'プラグイン',
@@ -6233,6 +6263,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Следующий шаг',
+    ext_gallery_after_install: 'После установки',
+    ext_gallery_local_component_required: 'У этого расширения есть локальный компонент. После установки запустите требуемое локальное приложение или sidecar.',
+    ext_gallery_local_app_label: 'Локальное приложение',
+    ext_gallery_required_suffix: 'Требуется {0}',
+    ext_gallery_sidecar_required: 'Требуется sidecar',
+    ext_gallery_native_host_required: 'Требуется нативный хост',
+    ext_gallery_open_setup_guide: 'Открыть руководство по настройке',
+    ext_gallery_install_restart_required: 'Расширение установлено. Для применения требуется перезапуск.',
+    ext_gallery_install_followup: 'Расширение установлено. Следующие шаги смотрите на карточке.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -7770,6 +7810,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Siguiente paso',
+    ext_gallery_after_install: 'Después de instalar',
+    ext_gallery_local_component_required: 'Esta extensión tiene un componente local. Después de instalarla, inicia la app local o el sidecar requerido.',
+    ext_gallery_local_app_label: 'App local',
+    ext_gallery_required_suffix: 'Se requiere {0}',
+    ext_gallery_sidecar_required: 'Se requiere sidecar',
+    ext_gallery_native_host_required: 'Se requiere host nativo',
+    ext_gallery_open_setup_guide: 'Abrir guía de configuración',
+    ext_gallery_install_restart_required: 'Extensión instalada. Reinicio requerido para aplicar.',
+    ext_gallery_install_followup: 'Extensión instalada. Consulta la tarjeta para ver los próximos pasos.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -8991,6 +9041,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Nächster Schritt',
+    ext_gallery_after_install: 'Nach der Installation',
+    ext_gallery_local_component_required: 'Diese Erweiterung hat eine lokale Komponente. Starte nach der Installation die erforderliche lokale App oder den Sidecar.',
+    ext_gallery_local_app_label: 'Lokale App',
+    ext_gallery_required_suffix: '{0} erforderlich',
+    ext_gallery_sidecar_required: 'Sidecar erforderlich',
+    ext_gallery_native_host_required: 'Nativer Host erforderlich',
+    ext_gallery_open_setup_guide: 'Einrichtungsanleitung öffnen',
+    ext_gallery_install_restart_required: 'Erweiterung installiert. Neustart zum Anwenden erforderlich.',
+    ext_gallery_install_followup: 'Erweiterung installiert. Die nächsten Schritte stehen auf der Karte.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -10879,6 +10939,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: '下一步',
+    ext_gallery_after_install: '安装后',
+    ext_gallery_local_component_required: '此扩展包含本地组件。安装后请启动所需的本地应用或 sidecar。',
+    ext_gallery_local_app_label: '本地应用',
+    ext_gallery_required_suffix: '需要 {0}',
+    ext_gallery_sidecar_required: '需要 sidecar',
+    ext_gallery_native_host_required: '需要原生主机',
+    ext_gallery_open_setup_guide: '打开设置指南',
+    ext_gallery_install_restart_required: '扩展已安装。需要重启后生效。',
+    ext_gallery_install_followup: '扩展已安装。请查看卡片中的后续步骤。',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_tab_system: '系统',
@@ -11722,6 +11792,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: '下一步',
+    ext_gallery_after_install: '安裝後',
+    ext_gallery_local_component_required: '此擴充功能包含本機元件。安裝後請啟動所需的本機應用程式或 sidecar。',
+    ext_gallery_local_app_label: '本機應用程式',
+    ext_gallery_required_suffix: '需要 {0}',
+    ext_gallery_sidecar_required: '需要 sidecar',
+    ext_gallery_native_host_required: '需要原生主機',
+    ext_gallery_open_setup_guide: '開啟設定指南',
+    ext_gallery_install_restart_required: '擴充功能已安裝。需要重新啟動後套用。',
+    ext_gallery_install_followup: '擴充功能已安裝。請查看卡片中的後續步驟。',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: '外掛',
@@ -13230,6 +13310,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Próximo passo',
+    ext_gallery_after_install: 'Após instalar',
+    ext_gallery_local_component_required: 'Esta extensão tem um componente local. Depois de instalar, inicie o app local ou sidecar necessário.',
+    ext_gallery_local_app_label: 'App local',
+    ext_gallery_required_suffix: '{0} necessário',
+    ext_gallery_sidecar_required: 'Sidecar necessário',
+    ext_gallery_native_host_required: 'Host nativo necessário',
+    ext_gallery_open_setup_guide: 'Abrir guia de configuração',
+    ext_gallery_install_restart_required: 'Extensão instalada. Reinício necessário para aplicar.',
+    ext_gallery_install_followup: 'Extensão instalada. Veja o cartão para os próximos passos.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -14744,6 +14834,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: '다음 단계',
+    ext_gallery_after_install: '설치 후',
+    ext_gallery_local_component_required: '이 확장에는 로컬 구성 요소가 있습니다. 설치 후 필요한 로컬 앱이나 사이드카를 시작하세요.',
+    ext_gallery_local_app_label: '로컬 앱',
+    ext_gallery_required_suffix: '{0} 필요',
+    ext_gallery_sidecar_required: '사이드카 필요',
+    ext_gallery_native_host_required: '네이티브 호스트 필요',
+    ext_gallery_open_setup_guide: '설정 가이드 열기',
+    ext_gallery_install_restart_required: '확장이 설치되었습니다. 적용하려면 다시 시작해야 합니다.',
+    ext_gallery_install_followup: '확장이 설치되었습니다. 카드에서 다음 단계를 확인하세요.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',  // TODO: translate
@@ -16368,6 +16468,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Étape suivante',
+    ext_gallery_after_install: 'Après l’installation',
+    ext_gallery_local_component_required: 'Cette extension comporte un composant local. Après l’installation, démarrez l’application locale ou le sidecar requis.',
+    ext_gallery_local_app_label: 'Application locale',
+    ext_gallery_required_suffix: '{0} requis',
+    ext_gallery_sidecar_required: 'Sidecar requis',
+    ext_gallery_native_host_required: 'Hôte natif requis',
+    ext_gallery_open_setup_guide: 'Ouvrir le guide de configuration',
+    ext_gallery_install_restart_required: 'Extension installée. Redémarrage requis pour appliquer.',
+    ext_gallery_install_followup: 'Extension installée. Consultez la carte pour les prochaines étapes.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugins',
@@ -17948,6 +18058,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Sonraki adım',
+    ext_gallery_after_install: 'Kurulumdan sonra',
+    ext_gallery_local_component_required: "Bu uzantının yerel bir bileşeni var. Kurulumdan sonra gerekli yerel uygulamayı veya sidecar'ı başlatın.",
+    ext_gallery_local_app_label: 'Yerel uygulama',
+    ext_gallery_required_suffix: '{0} gerekli',
+    ext_gallery_sidecar_required: 'Sidecar gerekli',
+    ext_gallery_native_host_required: 'Native host gerekli',
+    ext_gallery_open_setup_guide: 'Kurulum kılavuzunu aç',
+    ext_gallery_install_restart_required: 'Uzantı kuruldu. Uygulamak için yeniden başlatma gerekli.',
+    ext_gallery_install_followup: 'Uzantı kuruldu. Sonraki adımlar için kartı kontrol edin.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Eklentiler',
@@ -19574,6 +19694,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Następny krok',
+    ext_gallery_after_install: 'Po instalacji',
+    ext_gallery_local_component_required: 'To rozszerzenie ma komponent lokalny. Po instalacji uruchom wymaganą aplikację lokalną lub sidecar.',
+    ext_gallery_local_app_label: 'Aplikacja lokalna',
+    ext_gallery_required_suffix: 'Wymagane: {0}',
+    ext_gallery_sidecar_required: 'Wymagany sidecar',
+    ext_gallery_native_host_required: 'Wymagany host natywny',
+    ext_gallery_open_setup_guide: 'Otwórz przewodnik konfiguracji',
+    ext_gallery_install_restart_required: 'Rozszerzenie zainstalowane. Do zastosowania wymagany jest restart.',
+    ext_gallery_install_followup: 'Rozszerzenie zainstalowane. Sprawdź kartę, aby zobaczyć kolejne kroki.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Wtyczki',
@@ -21088,6 +21218,16 @@ const LOCALES = {
     ext_gallery_version: 'Version',
     ext_gallery_author: 'Author',
     ext_gallery_capabilities: 'Capabilities',
+    ext_gallery_next_step: 'Bước tiếp theo',
+    ext_gallery_after_install: 'Sau khi cài đặt',
+    ext_gallery_local_component_required: 'Tiện ích mở rộng này có thành phần cục bộ. Sau khi cài đặt, hãy khởi động ứng dụng cục bộ hoặc sidecar bắt buộc.',
+    ext_gallery_local_app_label: 'Ứng dụng cục bộ',
+    ext_gallery_required_suffix: 'Cần {0}',
+    ext_gallery_sidecar_required: 'Cần sidecar',
+    ext_gallery_native_host_required: 'Cần native host',
+    ext_gallery_open_setup_guide: 'Mở hướng dẫn thiết lập',
+    ext_gallery_install_restart_required: 'Đã cài đặt tiện ích mở rộng. Cần khởi động lại để áp dụng.',
+    ext_gallery_install_followup: 'Đã cài đặt tiện ích mở rộng. Xem thẻ để biết các bước tiếp theo.',
     ext_gallery_install_ok: 'Extension installed successfully.',
     ext_gallery_uninstall_ok: 'Extension uninstalled.',
     settings_plugins_title: 'Plugin',
diff --git a/static/panels.js b/static/panels.js
index ab9d50ff..14e8bf9b 100644
--- a/static/panels.js
+++ b/static/panels.js
@@ -8421,6 +8421,50 @@ function switchExtensionsTab(tab){
   if(tab==='gallery'&&!_extensionsGalleryLoaded) loadExtensionsGallery();
 }
 
+function _extensionSafeHttpUrl(value){
+  if(!value) return '';
+  const raw=String(value).trim();
+  if(!/^https?:\/\//i.test(raw)) return '';
+  try{
+    const url=new URL(raw);
+    if(url.username||url.password) return '';
+    return (url.protocol==='http:'||url.protocol==='https:')?url.href:'';
+  }catch(_){
+    return '';
+  }
+}
+
+function _extensionPostInstallNote(entry,isInstalled){
+  const lifecycle=(entry&&entry.lifecycle&&typeof entry.lifecycle==='object')?entry.lifecycle:{};
+  const post=(entry&&entry.post_install&&typeof entry.post_install==='object')?entry.post_install:null;
+  const needsSidecar=!!lifecycle.sidecar_start_required;
+  const needsNative=!!lifecycle.native_host_start_required;
+  const summary=post&&post.summary?String(post.summary):(
+    (needsSidecar||needsNative)
+      ? t('ext_gallery_local_component_required')
+      : ''
+  );
+  if(!summary) return '';
+  const docsUrl=_extensionSafeHttpUrl(post&&post.docs_url);
+  const localAppLabel=post&&post.local_app_label?String(post.local_app_label):t('ext_gallery_local_app_label');
+  const chips=[];
+  if(post&&post.requires_local_app===true) chips.push(t('ext_gallery_required_suffix',localAppLabel));
+  if(needsSidecar) chips.push(t('ext_gallery_sidecar_required'));
+  if(needsNative) chips.push(t('ext_gallery_native_host_required'));
+  const chipHtml=chips.length
+    ? '<div class="extension-gallery-next-chips">'+chips.map(item=>`<span>${esc(item)}</span>`).join('')+'</div>'
+    : '';
+  const docsHtml=docsUrl
+    ? `<a class="extension-gallery-next-link" href="${esc(docsUrl)}" target="_blank" rel="noopener noreferrer">${esc(t('ext_gallery_open_setup_guide'))}</a>`
+    : '';
+  return `<div class="extension-gallery-next-step">
+    <div class="extension-gallery-next-label">${esc(t(isInstalled?'ext_gallery_next_step':'ext_gallery_after_install'))}</div>
+    <div class="extension-gallery-next-summary">${esc(summary)}</div>
+    ${chipHtml}
+    ${docsHtml}
+  </div>`;
+}
+
 async function loadExtensionsGallery(){
   _extensionsGalleryLoaded=true;
   const galleryEl=$('extensionsGallery');
@@ -8468,9 +8512,10 @@ function _renderExtensionsGallery(entries,statusData){
     const caps=Array.isArray(entry.capabilities)?entry.capabilities:[];
     const perms=entry.permissions||null;
     const isInstalled=installedIds.has(String(entry.id||''));
-    const restartRequired=!!(entry.lifecycle&&entry.lifecycle.restart_required);
+    const restartRequired=!!(entry.lifecycle&&(entry.lifecycle.restart_required||entry.lifecycle.webui_restart_required));
     const badgesHtml=caps.map(c=>`<span class="extension-gallery-badge">${esc(String(c))}</span>`).join('');
     const permsHtml=perms?`<details class="extension-gallery-perms"><summary data-i18n="ext_gallery_permissions_show">Permissions</summary><pre>${esc(JSON.stringify(perms,null,2))}</pre></details>`:'';
+    const postInstallHtml=_extensionPostInstallNote(entry,isInstalled);
     const actionBtn=isInstalled
       ?`<button class="extension-gallery-uninstall-btn" data-ext-uninstall-id="${id}" type="button" data-i18n="ext_gallery_uninstall">Uninstall</button>`
       :`<button class="extension-gallery-install-btn" data-ext-install-id="${id}" type="button" data-i18n="ext_gallery_install">Install</button>`;
@@ -8484,6 +8529,7 @@ function _renderExtensionsGallery(entries,statusData){
       </div>
       <div class="extension-gallery-desc">${desc}</div>
       ${badgesHtml?'<div class="extension-gallery-badge-row">'+badgesHtml+'</div>':''}
+      ${postInstallHtml}
       ${permsHtml}
       <div class="extension-gallery-actions">${actionBtn}</div>
     </div>`;
@@ -8511,15 +8557,18 @@ async function handleExtensionInstall(btn,entry){
   if(!btn||btn.disabled) return;
   const previousText=btn.textContent;
   btn.disabled=true;
-  btn.textContent='Installing…';
+  btn.textContent=t('ext_gallery_installing');
   try{
     const result=await api('/api/extensions/install',{method:'POST',body:JSON.stringify({
       id:entry.id,
       download_url:entry.download_url||entry.download,
       sha256:entry.sha256,
     })});
-    const restart=!!(entry.lifecycle&&entry.lifecycle.restart_required);
-    showToast(restart?'Extension installed. Restart required to apply.':'Extension installed successfully.');
+    const restart=!!(entry.lifecycle&&(entry.lifecycle.restart_required||entry.lifecycle.webui_restart_required));
+    const hasPostInstall=!!(entry.post_install||(entry.lifecycle&&(entry.lifecycle.sidecar_start_required||entry.lifecycle.native_host_start_required)));
+    showToast(restart
+      ? t('ext_gallery_install_restart_required')
+      : (hasPostInstall?t('ext_gallery_install_followup'):t('ext_gallery_install_ok')));
     _extensionsGalleryLoaded=false;
     await loadExtensionsGallery();
   }catch(e){
diff --git a/static/style.css b/static/style.css
index 8e0b13d1..d645ccd4 100644
--- a/static/style.css
+++ b/static/style.css
@@ -4758,6 +4758,13 @@ main.main > #mainPlugin{display:none;}
 .extension-gallery-desc{font-size:12px;color:var(--muted);margin-top:6px;line-height:1.5;}
 .extension-gallery-badge-row{display:flex;flex-wrap:wrap;gap:4px;margin-top:8px;}
 .extension-gallery-badge{display:inline-flex;align-items:center;background:var(--code-bg);color:var(--muted);border-radius:999px;padding:2px 8px;font-size:10.5px;font-weight:600;font-family:var(--font-mono);}
+.extension-gallery-next-step{margin-top:10px;padding:9px 10px;border:1px solid var(--border);border-radius:8px;background:var(--subtle-bg,rgba(127,127,127,.06));}
+.extension-gallery-next-label{font-size:11px;font-weight:700;color:var(--text);text-transform:uppercase;letter-spacing:0;}
+.extension-gallery-next-summary{font-size:12px;color:var(--muted);line-height:1.45;margin-top:4px;}
+.extension-gallery-next-chips{display:flex;flex-wrap:wrap;gap:4px;margin-top:7px;}
+.extension-gallery-next-chips span{display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:999px;color:var(--muted);font-size:10.5px;font-weight:600;padding:2px 7px;background:var(--card-bg,var(--sidebar-bg));}
+.extension-gallery-next-link{display:inline-flex;margin-top:7px;font-size:12px;font-weight:600;color:var(--accent);text-decoration:none;}
+.extension-gallery-next-link:hover{text-decoration:underline;}
 .extension-gallery-perms{margin-top:8px;font-size:12px;}
 .extension-gallery-perms summary{cursor:pointer;color:var(--muted);user-select:none;}
 .extension-gallery-perms pre{margin:6px 0 0;padding:8px;background:var(--code-bg);border-radius:4px;font-size:11px;overflow-x:auto;white-space:pre-wrap;word-break:break-all;}
diff --git a/tests/test_extensions_settings_panel.py b/tests/test_extensions_settings_panel.py
index ca7853ea..20065e1a 100644
--- a/tests/test_extensions_settings_panel.py
+++ b/tests/test_extensions_settings_panel.py
@@ -38,6 +38,12 @@ def _locale_blocks() -> dict[str, str]:
     return blocks
 
 
+def _locale_string(block: str, key: str) -> str:
+    match = re.search(rf"\b{re.escape(key)}:\s*([\"'])(.*?)\1", block, re.DOTALL)
+    assert match, f"{key} not found in locale block"
+    return match.group(2)
+
+
 def _contains_post_method(block: str) -> bool:
     """Return True when a JS block contains a method: 'POST' style mutation."""
     return bool(re.search(r"\bmethod\s*:\s*([\"'`])POST\1", block))
@@ -207,6 +213,40 @@ def test_extensions_panel_toggle_uses_dedicated_endpoint_without_settings_or_ins
     assert "marketplace" not in combined.lower()
 
 
+def test_extensions_gallery_renders_post_install_guidance():
+    url_block = _between("function _extensionSafeHttpUrl", "function _extensionPostInstallNote")
+    gallery_block = _between("function _extensionPostInstallNote", "async function loadExtensionsGallery")
+    render_block = _between("function _renderExtensionsGallery", "function _bindExtensionGalleryButtons")
+    install_block = _between("async function handleExtensionInstall", "async function handleExtensionUninstall")
+
+    assert "/^https?:\\/\\//i.test(raw)" in url_block
+    assert "url.username||url.password" in url_block
+    assert "entry.post_install" in gallery_block
+    assert "post&&post.docs_url" in gallery_block
+    assert "sidecar_start_required" in gallery_block
+    assert "native_host_start_required" in gallery_block
+    assert "requires_local_app" in gallery_block
+    assert "local_app_label" in gallery_block
+    assert "t('ext_gallery_local_component_required')" in gallery_block
+    assert "t('ext_gallery_local_app_label')" in gallery_block
+    assert "t('ext_gallery_required_suffix',localAppLabel)" in gallery_block
+    assert "t('ext_gallery_sidecar_required')" in gallery_block
+    assert "t('ext_gallery_native_host_required')" in gallery_block
+    assert "t('ext_gallery_open_setup_guide')" in gallery_block
+    assert "t(isInstalled?'ext_gallery_next_step':'ext_gallery_after_install')" in gallery_block
+    assert "target=\"_blank\"" in gallery_block
+    assert "rel=\"noopener noreferrer\"" in gallery_block
+    assert "extension-gallery-next-step" in gallery_block
+    assert "esc(summary)" in gallery_block
+    assert "esc(docsUrl)" in gallery_block
+    assert "esc(item)" in gallery_block
+    assert "_extensionPostInstallNote(entry,isInstalled)" in render_block
+    assert "t('ext_gallery_install_restart_required')" in install_block
+    assert "t('ext_gallery_install_followup')" in install_block
+    assert "t('ext_gallery_install_ok')" in install_block
+    assert "webui_restart_required" in install_block
+
+
 def test_copy_extensions_diagnostics_copies_current_sanitized_payload():
     copy_block = _between("function copyExtensionsDiagnostics", "// ── Plugins panel")
 
@@ -228,14 +268,71 @@ def test_extensions_styles_are_scoped_to_extensions_panel():
     assert ".extension-sidecar-list" in STYLE_CSS
     assert ".extension-sidecar-runtime" in STYLE_CSS
     assert ".extension-sidecar-status-badge" in STYLE_CSS
+    assert ".extension-gallery-next-step" in STYLE_CSS
+    assert ".extension-gallery-next-link" in STYLE_CSS
 
 
-def test_extensions_tab_i18n_key_exists_for_all_locales():
+def test_extensions_i18n_keys_exist_for_all_locales():
     blocks = _locale_blocks()
 
     assert len(blocks) == _locale_count()
-    missing = [name for name, block in blocks.items() if "settings_tab_extensions" not in block]
-    assert not missing, f"Locale(s) missing settings_tab_extensions: {missing}"
+    required_keys = [
+        "settings_tab_extensions",
+        "ext_gallery_next_step",
+        "ext_gallery_after_install",
+        "ext_gallery_local_component_required",
+        "ext_gallery_local_app_label",
+        "ext_gallery_required_suffix",
+        "ext_gallery_sidecar_required",
+        "ext_gallery_native_host_required",
+        "ext_gallery_open_setup_guide",
+        "ext_gallery_install_restart_required",
+        "ext_gallery_install_followup",
+    ]
+    missing = {
+        name: [key for key in required_keys if key not in block]
+        for name, block in blocks.items()
+    }
+    missing = {name: keys for name, keys in missing.items() if keys}
+    assert not missing, f"Locale(s) missing extension i18n key(s): {missing}"
+
+
+def test_extensions_post_install_i18n_is_localized_outside_english():
+    blocks = _locale_blocks()
+    english = blocks["en"]
+    post_install_keys = [
+        "ext_gallery_next_step",
+        "ext_gallery_after_install",
+        "ext_gallery_local_component_required",
+        "ext_gallery_local_app_label",
+        "ext_gallery_required_suffix",
+        "ext_gallery_sidecar_required",
+        "ext_gallery_native_host_required",
+        "ext_gallery_open_setup_guide",
+        "ext_gallery_install_restart_required",
+        "ext_gallery_install_followup",
+    ]
+    english_values = {key: _locale_string(english, key) for key in post_install_keys}
+    untranslated = {
+        name: [
+            key
+            for key in post_install_keys
+            if _locale_string(block, key) == english_values[key]
+        ]
+        for name, block in blocks.items()
+        if name != "en"
+    }
+    untranslated = {name: keys for name, keys in untranslated.items() if keys}
+
+    assert not untranslated, f"Locale(s) keep English post-install guidance: {untranslated}"
+    for name, block in blocks.items():
+        assert "{0}" in _locale_string(block, "ext_gallery_required_suffix"), (
+            f"{name} must preserve the local-app label placeholder"
+        )
+
+
+def test_extensions_i18n_does_not_include_replacement_characters():
+    assert "\ufffd" not in I18N_JS
 
 
 def test_extensions_docs_mentions_settings_panel_without_install_or_proxy_claims():