diff --git a/packages/frontend/src/pages/qr.read.vue b/packages/frontend/src/pages/qr.read.vue
index b3cd18399a..d9d48d9e45 100644
--- a/packages/frontend/src/pages/qr.read.vue
+++ b/packages/frontend/src/pages/qr.read.vue
@@ -46,7 +46,7 @@ const uris = ref<string[]>([]);
 const usersSource = new Map<string, misskey.entities.UserDetailed | null>();
 const users = ref<(misskey.entities.UserDetailed)[]>([]);
 
-const timer = ref<ReturnType<typeof setTimeout> | null>(null);
+const timer = ref<ReturnType<typeof window.setTimeout> | null>(null);
 
 function updateUsers() {
 	users.value = uris.value.map(uri => usersSource.get(uri)).filter(u => u) as misskey.entities.UserDetailed[];
@@ -63,7 +63,7 @@ watch(uris, () => {
 
 	updateUsers();
 
-	timer.value = setTimeout(() => {
+	timer.value = window.setTimeout(() => {
 		console.log('Update users after 3 seconds');
 		timer.value = null;
 		if (updateRequired.value) {
@@ -102,7 +102,7 @@ async function processResult(result: QrScanner.ScanResult) {
 const alertLock = ref(false);
 
 onMounted(() => {
-	const videoEl = document.querySelector('video');
+	const videoEl = window.document.querySelector('video');
 
 	if (!videoEl) {
 		os.alert({
@@ -135,7 +135,7 @@ onMounted(() => {
 
 onUnmounted(() => {
 	if (timer.value) {
-		clearTimeout(timer.value);
+		window.clearTimeout(timer.value);
 		timer.value = null;
 	}
 
diff --git a/packages/frontend/src/pages/qr.show.vue b/packages/frontend/src/pages/qr.show.vue
index a081a323ce..5cb4770506 100644
--- a/packages/frontend/src/pages/qr.show.vue
+++ b/packages/frontend/src/pages/qr.show.vue
@@ -153,7 +153,7 @@ onUnmounted(() => {
 
 //#region flip
 const THRESHOLD = -3;
-// @ts-ignore
+// @ts-expect-error TS(2339)
 const deviceMotionPermissionNeeded = window.DeviceMotionEvent && typeof window.DeviceMotionEvent.requestPermission === 'function';
 const flipEls: Set<Element> = new Set();
 const flip = ref(false);
@@ -171,7 +171,7 @@ watch(flip, (newState) => {
 
 function requestDeviceMotion() {
 	if (!deviceMotionPermissionNeeded) return;
-	// @ts-ignore
+	// @ts-expect-error TS(2339)
 	window.DeviceMotionEvent.requestPermission()
 		.then((response: string) => {
 			if (response === 'granted') {