diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index 4a1100c324..bfc8179e13 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -94,6 +94,8 @@ async function calcAspectRatio() {
 onMounted(() => {
 	calcAspectRatio();
 
+	if (gallery.value == null) return; // TSを黙らすため
+
 	lightbox = new PhotoSwipeLightbox({
 		dataSource: props.mediaList
 			.filter(media => {
diff --git a/packages/frontend/src/components/MkPageWindow.vue b/packages/frontend/src/components/MkPageWindow.vue
index cf60c1ca3e..d21e09a984 100644
--- a/packages/frontend/src/components/MkPageWindow.vue
+++ b/packages/frontend/src/components/MkPageWindow.vue
@@ -23,8 +23,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 	</template>
 
 	<div :class="$style.root" class="_forceShrinkSpacer">
-		<StackingRouterView v-if="prefer.s['experimental.stackingRouterView']" :key="reloadCount" :router="windowRouter"/>
-		<RouterView v-else :key="reloadCount" :router="windowRouter"/>
+		<StackingRouterView v-if="prefer.s['experimental.stackingRouterView']" :key="reloadCount.toString() + ':stacking'" :router="windowRouter"/>
+		<RouterView v-else :key="reloadCount.toString() + ':non-stacking'" :router="windowRouter"/>
 	</div>
 </MkWindow>
 </template>
@@ -58,20 +58,15 @@ const windowRouter = createRouter(props.initialPath);
 
 const pageMetadata = ref<null | PageMetadata>(null);
 const windowEl = useTemplateRef('windowEl');
-const history = ref<{ path: string; }[]>([{
+const _history_ = ref<{ path: string; }[]>([{
 	path: windowRouter.getCurrentFullPath(),
 }]);
 const buttonsLeft = computed(() => {
-	const buttons: Record<string, unknown>[] = [];
-
-	if (history.value.length > 1) {
-		buttons.push({
-			icon: 'ti ti-arrow-left',
-			onClick: back,
-		});
-	}
-
-	return buttons;
+	return _history_.value.length > 1 ? [{
+		icon: 'ti ti-arrow-left',
+		title: i18n.ts.goBack,
+		onClick: back,
+	}] : [];
 });
 const buttonsRight = computed(() => {
 	const buttons = [{
@@ -97,12 +92,12 @@ function getSearchMarker(path: string) {
 const searchMarkerId = ref<string | null>(getSearchMarker(props.initialPath));
 
 windowRouter.addListener('push', ctx => {
-	history.value.push({ path: ctx.fullPath });
+	_history_.value.push({ path: ctx.fullPath });
 });
 
 windowRouter.addListener('replace', ctx => {
-	history.value.pop();
-	history.value.push({ path: ctx.fullPath });
+	_history_.value.pop();
+	_history_.value.push({ path: ctx.fullPath });
 });
 
 windowRouter.addListener('change', ctx => {
@@ -150,8 +145,8 @@ const contextmenu = computed(() => ([{
 }]));
 
 function back() {
-	history.value.pop();
-	windowRouter.replaceByPath(history.value.at(-1)!.path);
+	_history_.value.pop();
+	windowRouter.replaceByPath(_history_.value.at(-1)!.path);
 }
 
 function reload() {
diff --git a/packages/frontend/src/components/MkRoleSelectDialog.vue b/packages/frontend/src/components/MkRoleSelectDialog.vue
index fc7ba50fb3..f1cc98def4 100644
--- a/packages/frontend/src/components/MkRoleSelectDialog.vue
+++ b/packages/frontend/src/components/MkRoleSelectDialog.vue
@@ -105,9 +105,7 @@ async function addRole() {
 		.map(r => ({ text: r.name, value: r }));
 
 	const { canceled, result: role } = await os.select({ items });
-	if (canceled) {
-		return;
-	}
+	if (canceled || role == null) return;
 
 	selectedRoleIds.value.push(role.id);
 }
diff --git a/packages/frontend/src/pages/settings/plugin.install.vue b/packages/frontend/src/pages/settings/plugin.install.vue
index 22b53b4b96..8ed7f2a7b6 100644
--- a/packages/frontend/src/pages/settings/plugin.install.vue
+++ b/packages/frontend/src/pages/settings/plugin.install.vue
@@ -40,7 +40,7 @@ async function install() {
 		code.value = null;
 
 		router.push('/settings/plugin');
-	} catch (err) {
+	} catch (err: any) {
 		os.alert({
 			type: 'error',
 			title: 'Install failed',
diff --git a/packages/frontend/src/pages/welcome.entrance.classic.vue b/packages/frontend/src/pages/welcome.entrance.classic.vue
index c2cf937c71..cddec3332e 100644
--- a/packages/frontend/src/pages/welcome.entrance.classic.vue
+++ b/packages/frontend/src/pages/welcome.entrance.classic.vue
@@ -53,7 +53,7 @@ function getInstanceIcon(instance: Misskey.entities.FederationInstance): string
 misskeyApiGet('federation/instances', {
 	sort: '+pubSub',
 	limit: 20,
-	blocked: 'false',
+	blocked: false,
 }).then(_instances => {
 	instances.value = _instances;
 });
diff --git a/packages/frontend/src/utility/extract-mentions.ts b/packages/frontend/src/utility/extract-mentions.ts
index d518562053..2ec9349718 100644
--- a/packages/frontend/src/utility/extract-mentions.ts
+++ b/packages/frontend/src/utility/extract-mentions.ts
@@ -9,7 +9,7 @@ import * as mfm from 'mfm-js';
 
 export function extractMentions(nodes: mfm.MfmNode[]): mfm.MfmMention['props'][] {
 	// TODO: 重複を削除
-	const mentionNodes = mfm.extract(nodes, (node) => node.type === 'mention');
+	const mentionNodes = mfm.extract(nodes, (node) => node.type === 'mention') as mfm.MfmMention[];
 	const mentions = mentionNodes.map(x => x.props);
 
 	return mentions;