diff --git a/packages/frontend/src/pages/theme-editor.vue b/packages/frontend/src/pages/theme-editor.vue
index a6dbd3150289..a66871cd133f 100644
--- a/packages/frontend/src/pages/theme-editor.vue
+++ b/packages/frontend/src/pages/theme-editor.vue
@@ -93,7 +93,6 @@ import * as os from '@/os.js';
 import { ColdDeviceStorage, defaultStore } from '@/store.js';
 import { addTheme } from '@/theme-store.js';
 import { i18n } from '@/i18n.js';
-import { useLeaveGuard } from '@/scripts/use-leave-guard.js';
 import { definePageMetadata } from '@/scripts/page-metadata.js';
 
 const $i = signinRequired();
@@ -133,9 +132,6 @@ const theme = ref<Pick<Theme, 'base' | 'props'> & Partial<Theme>>({
 });
 const description = ref<string | null>(null);
 const themeCode = ref<string | null>(null);
-const changed = ref(false);
-
-useLeaveGuard(changed);
 
 function showPreview() {
 	os.pageWindow('/preview');
@@ -170,7 +166,6 @@ function setFgColor(color) {
 function apply() {
 	themeCode.value = JSON5.stringify(theme.value, null, '\t');
 	applyTheme(theme.value as Theme, false);
-	changed.value = true;
 }
 
 function applyThemeCode() {
@@ -211,7 +206,7 @@ async function saveAs() {
 	} else {
 		ColdDeviceStorage.set('lightTheme', theme.value as Theme);
 	}
-	changed.value = false;
+
 	os.alert({
 		type: 'success',
 		text: i18n.tsx._theme.installed({ name: theme.value.name }),
diff --git a/packages/frontend/src/scripts/use-leave-guard.ts b/packages/frontend/src/scripts/use-leave-guard.ts
deleted file mode 100644
index 395c12a756ae..000000000000
--- a/packages/frontend/src/scripts/use-leave-guard.ts
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * SPDX-FileCopyrightText: syuilo and misskey-project
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-import type { Ref } from 'vue';
-
-export function useLeaveGuard(enabled: Ref<boolean>) {
-	/* TODO
-	const setLeaveGuard = inject('setLeaveGuard');
-
-	if (setLeaveGuard) {
-		setLeaveGuard(async () => {
-			if (!enabled.value) return false;
-
-			const { canceled } = await os.confirm({
-				type: 'warning',
-				text: i18n.ts.leaveConfirm,
-			});
-
-			return canceled;
-		});
-	} else {
-		onBeforeRouteLeave(async (to, from) => {
-			if (!enabled.value) return true;
-
-			const { canceled } = await os.confirm({
-				type: 'warning',
-				text: i18n.ts.leaveConfirm,
-			});
-
-			return !canceled;
-		});
-	}
-	*/
-
-	/*
-	function onBeforeLeave(ev: BeforeUnloadEvent) {
-		if (enabled.value) {
-			ev.preventDefault();
-			ev.returnValue = '';
-		}
-	}
-
-	window.addEventListener('beforeunload', onBeforeLeave);
-	onUnmounted(() => {
-		window.removeEventListener('beforeunload', onBeforeLeave);
-	});
-	*/
-}