diff --git a/packages/backend/src/remote/activitypub/resolver.ts b/packages/backend/src/remote/activitypub/resolver.ts
index 5c9d44292e..e89a7b21a7 100644
--- a/packages/backend/src/remote/activitypub/resolver.ts
+++ b/packages/backend/src/remote/activitypub/resolver.ts
@@ -76,7 +76,7 @@ export default class Resolver {
 			throw new Error('Instance is not allowed');
 		}
 
-		if (!this.user) {
+		if (config.signToActivityPubGet && !this.user) {
 			this.user = await getInstanceActor();
 		}
 
diff --git a/packages/backend/src/server/api/endpoints/notes/children.ts b/packages/backend/src/server/api/endpoints/notes/children.ts
index 7f2245c7e7..72282b3de0 100644
--- a/packages/backend/src/server/api/endpoints/notes/children.ts
+++ b/packages/backend/src/server/api/endpoints/notes/children.ts
@@ -12,8 +12,6 @@ export const meta = {
 	requireCredential: false,
 	requireCredentialPrivateMode: true,
 
-	description: 'Get a list of children of a notes. Children includes replies as well as quote renotes that quote the respective post. A post will not be duplicated if it is a reply and a quote of a note in this thread. For depths larger than 1 the threading has to be computed by the client.',
-
 	res: {
 		type: 'array',
 		optional: false, nullable: false,
@@ -29,20 +27,7 @@ export const paramDef = {
 	type: 'object',
 	properties: {
 		noteId: { type: 'string', format: 'misskey:id' },
-		limit: {
-			description: 'The maximum number of replies/quotes to show per parent note, i.e. the maximum number of children each note may have.',
-			type: 'integer',
-			minimum: 1,
-			maximum: 100,
-			default: 10,
-		},
-		depth: {
-			description: 'The number of layers of replies to fetch at once. Defaults to 1 for backward compatibility.',
-			type: 'integer',
-			minimum: 1,
-			maximum: 100,
-			default: 1,
-		},
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 10 },
 		sinceId: { type: 'string', format: 'misskey:id' },
 		untilId: { type: 'string', format: 'misskey:id' },
 	},
diff --git a/packages/backend/src/server/web/index.ts b/packages/backend/src/server/web/index.ts
index 4a6dfaff17..975cb6b668 100644
--- a/packages/backend/src/server/web/index.ts
+++ b/packages/backend/src/server/web/index.ts
@@ -327,32 +327,24 @@ router.get('/notes/:note', async (ctx, next) => {
 	});
 
 	if (note) {
-		try {
-			// FIXME: packing with detail may throw an error if the reply or renote is not visible (#8774)
-			const _note = await Notes.pack(note);
-			const profile = await UserProfiles.findOneByOrFail({ userId: note.userId });
-			const meta = await fetchMeta();
-			await ctx.render('note', {
-				note: _note,
-				profile,
-				avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: note.userId })),
-				// TODO: Let locale changeable by instance setting
-				summary: getNoteSummary(_note),
-				instanceName: meta.name || 'Calckey',
-				icon: meta.iconUrl,
-				themeColor: meta.themeColor,
-			});
+		const _note = await Notes.pack(note);
+		const profile = await UserProfiles.findOneByOrFail({ userId: note.userId });
+		const meta = await fetchMeta();
+		await ctx.render('note', {
+			note: _note,
+			profile,
+			avatarUrl: await Users.getAvatarUrl(await Users.findOneByOrFail({ id: note.userId })),
+			// TODO: Let locale changeable by instance setting
+			summary: getNoteSummary(_note),
+			instanceName: meta.name || 'Calckey',
+			icon: meta.iconUrl,
+			privateMode: meta.privateMode,
+			themeColor: meta.themeColor,
+		});
 
-			ctx.set('Cache-Control', 'public, max-age=15');
+		ctx.set('Cache-Control', 'public, max-age=15');
 
-			return;
-		} catch (err) {
-			if (err.id === '9725d0ce-ba28-4dde-95a7-2cbb2c15de24') {
-				// note not visible to user
-			} else {
-				throw err;
-			}
-		}
+		return;
 	}
 
 	await next();
@@ -543,7 +535,6 @@ router.get('(.*)', async ctx => {
 		splashIcon: splashIconUrl,
 		themeColor: meta.themeColor,
 		privateMode: meta.privateMode,
-		randomMOTD: motd[Math.floor(Math.random() * motd.length)],
 	});
 	ctx.set('Cache-Control', 'public, max-age=3');
 });
diff --git a/packages/backend/src/server/web/views/base.pug b/packages/backend/src/server/web/views/base.pug
index d019d2f649..ed1689da79 100644
--- a/packages/backend/src/server/web/views/base.pug
+++ b/packages/backend/src/server/web/views/base.pug
@@ -58,7 +58,7 @@ html
 
 		block og
 			meta(property='og:title'       content= title || 'Calckey')
-			meta(property='og:description' content= desc || '✨🌎✨ A interplanetary communication platform ✨🚀✨')
+			meta(property='og:description' content= desc || '✨🌎 A interplanetary communication platform 🚀✨')
 			meta(property='og:image'       content= img)
 
 		style
diff --git a/packages/backend/src/server/web/views/channel.pug b/packages/backend/src/server/web/views/channel.pug
index fd5da0deb5..c4594b7666 100644
--- a/packages/backend/src/server/web/views/channel.pug
+++ b/packages/backend/src/server/web/views/channel.pug
@@ -1,7 +1,7 @@
 extends ./base
 
 block vars
-	- const title = privateMode ? '非公開インスタンス' : channel.name;
+	- const title = privateMode ? instanceName : channel.name;
 	- const url = `${config.url}/channels/${channel.id}`;
 
 block title
diff --git a/packages/backend/src/server/web/views/clip.pug b/packages/backend/src/server/web/views/clip.pug
index 5247b56af5..2432470c10 100644
--- a/packages/backend/src/server/web/views/clip.pug
+++ b/packages/backend/src/server/web/views/clip.pug
@@ -2,7 +2,7 @@ extends ./base
 
 block vars
 	- const user = clip.user;
-	- const title = privateMode ? '非公開インスタンス' : clip.name;
+	- const title = privateMode ? instanceName : clip.name;
 	- const url = `${config.url}/clips/${clip.id}`;
 
 block title
diff --git a/packages/backend/src/server/web/views/gallery-post.pug b/packages/backend/src/server/web/views/gallery-post.pug
index 1bbe740b2e..1b1c2fbfbd 100644
--- a/packages/backend/src/server/web/views/gallery-post.pug
+++ b/packages/backend/src/server/web/views/gallery-post.pug
@@ -2,7 +2,7 @@ extends ./base
 
 block vars
 	- const user = post.user;
-	- const title = privateMode ? '非公開インスタンス' : post.title;
+	- const title = privateMode ? instanceName : post.title;
 	- const url = `${config.url}/gallery/${post.id}`;
 
 block title
diff --git a/packages/backend/src/server/web/views/note.pug b/packages/backend/src/server/web/views/note.pug
index 1e6efa3757..6b55f6ba03 100644
--- a/packages/backend/src/server/web/views/note.pug
+++ b/packages/backend/src/server/web/views/note.pug
@@ -2,7 +2,7 @@ extends ./base
 
 block vars
 	- const user = note.user;
-	- const title = privateMode ? '非公開インスタンス' : (user.name ? `${user.name} (@${user.username})` : `@${user.username}`);
+	- const title = privateMode ? instanceName : (user.name ? `${user.name} (@${user.username})` : `@${user.username}`);
 	- const url = `${config.url}/notes/${note.id}`;
 	- const isRenote = note.renote && note.text == null && note.fileIds.length == 0 && note.poll == null;
 
diff --git a/packages/backend/src/server/web/views/page.pug b/packages/backend/src/server/web/views/page.pug
index 3378562d46..1095282131 100644
--- a/packages/backend/src/server/web/views/page.pug
+++ b/packages/backend/src/server/web/views/page.pug
@@ -2,7 +2,7 @@ extends ./base
 
 block vars
 	- const user = page.user;
-	- const title = privateMode ? '非公開インスタンス' : page.title;
+	- const title = privateMode ? instanceName : page.title;
 	- const url = `${config.url}/@${user.username}/${page.name}`;
 
 block title
diff --git a/packages/backend/src/server/web/views/user.pug b/packages/backend/src/server/web/views/user.pug
index d52a92694c..cc14dedb3a 100644
--- a/packages/backend/src/server/web/views/user.pug
+++ b/packages/backend/src/server/web/views/user.pug
@@ -1,7 +1,7 @@
 extends ./base
 
 block vars
-	- const title = privateMode ? '非公開インスタンス' : (user.name ? `${user.name} (@${user.username})` : `@${user.username}`);
+	- const title = privateMode ? instanceName : (user.name ? `${user.name} (@${user.username})` : `@${user.username}`);
 	- const url = `${config.url}/@${(user.host ? `${user.username}@${user.host}` : user.username)}`;
 
 block title
diff --git a/packages/client/src/pages/admin/security.vue b/packages/client/src/pages/admin/security.vue
index be3d27abaa..735c7dc3e6 100644
--- a/packages/client/src/pages/admin/security.vue
+++ b/packages/client/src/pages/admin/security.vue
@@ -133,6 +133,7 @@ import FormRange from '@/components/form/range.vue';
 import FormInput from '@/components/form/input.vue';
 import FormTextarea from '@/components/form/textarea.vue';
 import FormButton from '@/components/MkButton.vue';
+import FormTextarea from '@/components/form/textarea.vue';
 import * as os from '@/os';
 import { fetchInstance } from '@/instance';
 import { i18n } from '@/i18n';