diff --git a/locales/index.d.ts b/locales/index.d.ts
index 8051a1f24..6760927e1 100644
--- a/locales/index.d.ts
+++ b/locales/index.d.ts
@@ -580,6 +580,14 @@ export interface Locale extends ILocale {
      * リノートのミュートを解除
      */
     "renoteUnmute": string;
+    /**
+     * リアクションのミュート
+     */
+    "mutedReactions": string;
+    /**
+     * リモートの絵文字をミュート
+     */
+    "remoteCustomEmojiMuted": string;
     /**
      * ブロック
      */
diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 6783a4dca..138da8e9c 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -141,6 +141,8 @@ mute: "ミュート"
 unmute: "ミュート解除"
 renoteMute: "リノートをミュート"
 renoteUnmute: "リノートのミュートを解除"
+mutedReactions: "リアクションのミュート"
+remoteCustomEmojiMuted: "リモートの絵文字をミュート"
 block: "ブロック"
 unblock: "ブロック解除"
 suspend: "凍結"
diff --git a/package.json b/package.json
index 107fc6075..82060428a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "misskey",
-	"version": "2024.5.0-host.3a",
+	"version": "2024.5.0-host.3b",
 	"codename": "nasubi",
 	"repository": {
 		"type": "git",
diff --git a/packages/backend/src/server/sso/JWTIdentifyProviderService.ts b/packages/backend/src/server/sso/JWTIdentifyProviderService.ts
index bb21a8e98..63e412ff1 100644
--- a/packages/backend/src/server/sso/JWTIdentifyProviderService.ts
+++ b/packages/backend/src/server/sso/JWTIdentifyProviderService.ts
@@ -64,11 +64,12 @@ export class JWTIdentifyProviderService {
 
 		fastify.all<{
 			Params: { serviceId: string };
-			Querystring?: { serviceurl?: string, return_to?: string };
-			Body?: { serviceurl?: string, return_to?: string };
+			Querystring?: { serviceurl?: string, return_to?: string, prompt?: string };
+			Body?: { serviceurl?: string, return_to?: string, prompt?: string };
 		}>('/:serviceId', async (request, reply) => {
 			const serviceId = request.params.serviceId;
 			const returnTo = request.query?.return_to ?? request.query?.serviceurl ?? request.body?.return_to ?? request.body?.serviceurl;
+			const prompt = request.query?.prompt ?? request.body?.prompt ?? 'consent';
 
 			const ssoServiceProvider = await this.singleSignOnServiceProviderRepository.findOneBy({ id: serviceId, type: 'jwt' });
 			if (!ssoServiceProvider) {
@@ -101,6 +102,7 @@ export class JWTIdentifyProviderService {
 				transactionId: transactionId,
 				serviceName: ssoServiceProvider.name ?? ssoServiceProvider.issuer,
 				kind: 'jwt',
+				prompt: prompt,
 			});
 		});
 
diff --git a/packages/backend/src/server/sso/SAMLIdentifyProviderService.ts b/packages/backend/src/server/sso/SAMLIdentifyProviderService.ts
index 2412f0357..60ce37d8e 100644
--- a/packages/backend/src/server/sso/SAMLIdentifyProviderService.ts
+++ b/packages/backend/src/server/sso/SAMLIdentifyProviderService.ts
@@ -201,13 +201,14 @@ export class SAMLIdentifyProviderService {
 
 		fastify.all<{
 			Params: { serviceId: string };
-			Querystring?: { SAMLRequest?: string; RelayState?: string };
-			Body?: { SAMLRequest?: string; RelayState?: string };
+			Querystring?: { SAMLRequest?: string; RelayState?: string, prompt?: string };
+			Body?: { SAMLRequest?: string; RelayState?: string, prompt?: string };
 		}>('/:serviceId', async (request, reply) => {
 			const serviceId = request.params.serviceId;
 			const binding = request.query?.SAMLRequest ? 'redirect' : 'post';
 			const samlRequest = request.query?.SAMLRequest ?? request.body?.SAMLRequest;
 			const relayState = request.query?.RelayState ?? request.body?.RelayState;
+			const prompt = request.query?.prompt ?? request.body?.prompt ?? 'consent';
 
 			const ssoServiceProvider = await this.singleSignOnServiceProviderRepository.findOneBy({ id: serviceId, type: 'saml', privateKey: Not(IsNull()) });
 			if (!ssoServiceProvider) {
@@ -268,6 +269,7 @@ export class SAMLIdentifyProviderService {
 					transactionId: transactionId,
 					serviceName: ssoServiceProvider.name ?? ssoServiceProvider.issuer,
 					kind: 'saml',
+					prompt: prompt,
 				});
 			} catch (err) {
 				this.#logger.error('Failed to parse SAML request', { error: err });
diff --git a/packages/backend/src/server/web/views/sso.pug b/packages/backend/src/server/web/views/sso.pug
index bc1248127..d929c9721 100644
--- a/packages/backend/src/server/web/views/sso.pug
+++ b/packages/backend/src/server/web/views/sso.pug
@@ -4,3 +4,4 @@ block meta
 	meta(name='misskey:sso:transaction-id' content=transactionId)
 	meta(name='misskey:sso:service-name' content=serviceName)
 	meta(name='misskey:sso:kind' content=kind)
+	meta(name='misskey:sso:prompt' content=prompt)
diff --git a/packages/frontend/src/components/MkEmojiPickerDialog.vue b/packages/frontend/src/components/MkEmojiPickerDialog.vue
index 90b37e390..65f227e9a 100644
--- a/packages/frontend/src/components/MkEmojiPickerDialog.vue
+++ b/packages/frontend/src/components/MkEmojiPickerDialog.vue
@@ -29,15 +29,29 @@ SPDX-License-Identifier: AGPL-3.0-only
 		:max-height="maxHeight"
 		@chosen="chosen"
 	/>
+	<div v-if="manualReactionInput" :class="$style.remoteReactionInputWrapper">
+		<span>{{ i18n.ts.remoteCustomEmojiMuted }}</span>
+		<MkInput v-model="remoteReactionName" placeholder=":emojiname@host:" autocapitalize="off"/>
+		<MkButton :disabled="!(remoteReactionName && remoteReactionName[0] === ':')" @click="chosen(remoteReactionName)">
+			{{ i18n.ts.add }}
+		</MkButton>
+		<div :class="$style.emojiContainer">
+			<MkCustomEmoji v-if="remoteReactionName && remoteReactionName[0] === ':' " :class="$style.emoji" :name="remoteReactionName" :normal="true"/>
+		</div>
+	</div>
 </MkModal>
 </template>
 
 <script lang="ts" setup>
 import * as Misskey from 'misskey-js';
-import { shallowRef } from 'vue';
+import { shallowRef, ref } from 'vue';
+import { i18n } from '@/i18n.js';
 import MkModal from '@/components/MkModal.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
 import MkEmojiPicker from '@/components/MkEmojiPicker.vue';
 import { defaultStore } from '@/store.js';
+import MkCustomEmoji from '@/components/global/MkCustomEmoji.vue';
 
 const props = withDefaults(defineProps<{
 	manualShowing?: boolean | null;
@@ -47,12 +61,14 @@ const props = withDefaults(defineProps<{
 	asReactionPicker?: boolean;
 	targetNote?: Misskey.entities.Note;
 	choseAndClose?: boolean;
+	manualReactionInput?: boolean;
 }>(), {
 	manualShowing: null,
 	showPinned: true,
 	pinnedEmojis: undefined,
 	asReactionPicker: false,
 	choseAndClose: true,
+	manualReactionInput: false,
 });
 
 const emit = defineEmits<{
@@ -64,6 +80,8 @@ const emit = defineEmits<{
 const modal = shallowRef<InstanceType<typeof MkModal>>();
 const picker = shallowRef<InstanceType<typeof MkEmojiPicker>>();
 
+const remoteReactionName = ref('');
+
 function chosen(emoji: string) {
 	emit('done', emoji);
 	if (props.choseAndClose) {
@@ -88,4 +106,16 @@ function opening() {
 	border-bottom-right-radius: 0;
 	border-bottom-left-radius: 0;
 }
+
+.remoteReactionInputWrapper {
+	margin-top: var(--margin);
+	padding: 16px;
+	border-radius: var(--radius);
+	background: var(--popup);
+}
+
+.emojiContainer {
+	height: 48px;
+	width: 48px;
+}
 </style>
diff --git a/packages/frontend/src/components/MkReactionsViewer.vue b/packages/frontend/src/components/MkReactionsViewer.vue
index 63b202f9f..302a7ea12 100644
--- a/packages/frontend/src/components/MkReactionsViewer.vue
+++ b/packages/frontend/src/components/MkReactionsViewer.vue
@@ -22,6 +22,7 @@ import * as Misskey from 'misskey-js';
 import { inject, watch, ref } from 'vue';
 import XReaction from '@/components/MkReactionsViewer.reaction.vue';
 import { defaultStore } from '@/store.js';
+import { $i } from '@/account.js';
 
 const props = withDefaults(defineProps<{
 	note: Misskey.entities.Note;
@@ -45,6 +46,13 @@ if (props.note.myReaction && !Object.keys(reactions.value).includes(props.note.m
 	reactions.value[props.note.myReaction] = props.note.reactions[props.note.myReaction];
 }
 
+function shouldDisplayReaction([reaction]: [string, number]): boolean {
+	if (!$i) return true; // 非ログイン状態なら全部のリアクションを見れるように
+	if (reaction === props.note.myReaction) return true; // 自分がつけたリアクションなら表示する
+	if (!defaultStore.state.mutedReactions.includes(reaction.replace('@.', ''))) return true; // ローカルの絵文字には @. というsuffixがつくのでそれを消してから比較してあげる
+	return false;
+}
+
 function onMockToggleReaction(emoji: string, count: number) {
 	if (!mock) return;
 
@@ -80,7 +88,7 @@ watch([() => props.note.reactions, () => props.maxNumber], ([newSource, maxNumbe
 		newReactions.push([props.note.myReaction, newSource[props.note.myReaction]]);
 	}
 
-	reactions.value = newReactions;
+	reactions.value = newReactions.filter(shouldDisplayReaction);
 }, { immediate: true, deep: true });
 </script>
 
@@ -104,6 +112,7 @@ watch([() => props.note.reactions, () => props.maxNumber], ([newSource, maxNumbe
 	flex-wrap: wrap;
 	align-items: center;
 	margin: 4px -2px 0 -2px;
+	max-width: 100%;
 
 	&:empty {
 		display: none;
diff --git a/packages/frontend/src/components/global/MkCustomEmoji.vue b/packages/frontend/src/components/global/MkCustomEmoji.vue
index dbcb00460..de6dc5b87 100644
--- a/packages/frontend/src/components/global/MkCustomEmoji.vue
+++ b/packages/frontend/src/components/global/MkCustomEmoji.vue
@@ -4,7 +4,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 -->
 
 <template>
-<span v-if="errored">:{{ customEmojiName }}:</span>
+<img v-if="errored" src="/client-assets/dummy.png" :alt="alt" :title="alt" decoding="async" :class="[$style.root, { [$style.normal]: normal, [$style.noStyle]: noStyle }]"/>
 <img
 	v-else
 	:class="[$style.root, { [$style.normal]: normal, [$style.noStyle]: noStyle }]"
@@ -19,7 +19,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, inject, ref } from 'vue';
+import { computed, inject, ref, watch } from 'vue';
 import { getProxiedImageUrl, getStaticImageUrl } from '@/scripts/media-proxy.js';
 import { defaultStore } from '@/store.js';
 import { customEmojisMap } from '@/custom-emojis.js';
@@ -73,6 +73,10 @@ const url = computed(() => {
 		: proxied;
 });
 
+watch(url, (newValue) => {
+errored.value = (newValue === undefined);
+});
+
 const alt = computed(() => `:${customEmojiName.value}:`);
 const errored = ref(url.value == null);
 
diff --git a/packages/frontend/src/pages/settings/mute-block.vue b/packages/frontend/src/pages/settings/mute-block.vue
index de4db848d..2445a14d5 100644
--- a/packages/frontend/src/pages/settings/mute-block.vue
+++ b/packages/frontend/src/pages/settings/mute-block.vue
@@ -12,6 +12,23 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<XWordMute :muted="$i.mutedWords" @save="saveMutedWords"/>
 	</MkFolder>
 
+	<MkFolder>
+		<template #icon><i class="ti ti-message-off"></i></template>
+		<template #label>{{ i18n.ts.mutedReactions }}</template>
+
+		<div class="_gaps">
+			<div v-panel style="border-radius: var(--radius); padding: var(--margin);">
+				<button v-for="emoji in mutedReactions" class="_button" :class="$style.emojisItem" @click="removeReaction(emoji, $event)">
+					<MkCustomEmoji v-if="emoji && emoji[0] === ':'" :name="emoji"/>
+					<MkEmoji v-else :emoji="emoji ? emoji : 'null'"/>
+				</button>
+				<button class="_button" @click="chooseReaction">
+					<i class="ti ti-plus"></i>
+				</button>
+			</div>
+		</div>
+	</MkFolder>
+
 	<MkFolder>
 		<template #icon><i class="ti ti-planet-off"></i></template>
 		<template #label>{{ i18n.ts.instanceMute }}</template>
@@ -119,7 +136,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref, computed } from 'vue';
+import { ref, computed, watch, Ref } from 'vue';
 import XInstanceMute from './mute-block.instance-mute.vue';
 import XWordMute from './mute-block.word-mute.vue';
 import MkPagination from '@/components/MkPagination.vue';
@@ -132,6 +149,9 @@ import { misskeyApi } from '@/scripts/misskey-api.js';
 import { infoImageUrl } from '@/instance.js';
 import { signinRequired } from '@/account.js';
 import MkFolder from '@/components/MkFolder.vue';
+import MkCustomEmoji from '@/components/global/MkCustomEmoji.vue';
+import MkEmoji from '@/components/global/MkEmoji.vue';
+import { defaultStore } from '@/store.js';
 
 const $i = signinRequired();
 
@@ -154,6 +174,38 @@ const expandedRenoteMuteItems = ref([]);
 const expandedMuteItems = ref([]);
 const expandedBlockItems = ref([]);
 
+const mutedReactions = ref<string[]>(defaultStore.state.mutedReactions);
+
+watch(mutedReactions, () => {
+	defaultStore.set('mutedReactions', mutedReactions.value);
+}, {
+	deep: true,
+});
+
+const chooseReaction = (ev: MouseEvent) => pickEmoji(mutedReactions, ev);
+const removeReaction = (reaction: string, ev: MouseEvent) => remove(mutedReactions, reaction, ev);
+
+function remove(itemsRef: Ref<string[]>, reaction: string, ev: MouseEvent) {
+	os.popupMenu([{
+		text: i18n.ts.remove,
+		action: () => {
+			itemsRef.value = itemsRef.value.filter(x => x !== reaction);
+		},
+	}], ev.currentTarget ?? ev.target);
+}
+
+async function pickEmoji(itemsRef: Ref<string[]>, ev: MouseEvent) {
+	os.pickEmoji(ev.currentTarget ?? ev.target, {
+		showPinned: false,
+		manualReactionInput: true,
+	}).then(it => {
+		const emoji = it;
+		if (!itemsRef.value.includes(emoji)) {
+			itemsRef.value.push(emoji);
+		}
+	});
+}
+
 async function unrenoteMute(user, ev) {
 	os.popupMenu([{
 		text: i18n.ts.renoteUnmute,
@@ -263,4 +315,9 @@ definePageMetadata(() => ({
 		transform: rotateX(180deg);
 	}
 }
+
+.emojisItem{
+	display: inline-block;
+	padding: 8px;
+}
 </style>
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index d2e1944a8..da6fb5f6b 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -120,6 +120,7 @@ const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
 	'sound_notification',
 	'sound_antenna',
 	'sound_channel',
+	'mutedReactions',
 ];
 const coldDeviceStorageSaveKeys: (keyof typeof ColdDeviceStorage.default)[] = [
 	'lightTheme',
diff --git a/packages/frontend/src/pages/sso.vue b/packages/frontend/src/pages/sso.vue
index d47688bd9..d113f0712 100644
--- a/packages/frontend/src/pages/sso.vue
+++ b/packages/frontend/src/pages/sso.vue
@@ -33,7 +33,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { ref, nextTick } from 'vue';
+import { ref, nextTick, onMounted } from 'vue';
 import MkSignin from '@/components/MkSignin.vue';
 import MkButton from '@/components/MkButton.vue';
 import { $i, login } from '@/account.js';
@@ -47,6 +47,7 @@ if (transactionIdMeta) {
 }
 const name = document.querySelector<HTMLMetaElement>('meta[name="misskey:sso:service-name"]')?.content;
 const kind = document.querySelector<HTMLMetaElement>('meta[name="misskey:sso:kind"]')?.content;
+const prompt = document.querySelector<HTMLMetaElement>('meta[name="misskey:sso:prompt"]')?.content;
 
 const loading = ref(false);
 const postBindingForm = ref<HTMLFormElement | null>(null);
@@ -90,6 +91,12 @@ async function authorize(): Promise<void> {
 	}
 }
 
+onMounted(() => {
+	if ($i && prompt === 'none') {
+		onAccept();
+	}
+});
+
 definePageMetadata(() => ({
 	title: 'Single Sign-On',
 	icon: 'ti ti-apps',
diff --git a/packages/frontend/src/store.ts b/packages/frontend/src/store.ts
index e813722a6..8ed9de227 100644
--- a/packages/frontend/src/store.ts
+++ b/packages/frontend/src/store.ts
@@ -507,6 +507,10 @@ export const defaultStore = markRaw(new Storage('base', {
 		where: 'device',
 		default: { type: 'syuilo/bubble2', volume: 1 } as SoundStore,
 	},
+	mutedReactions: {
+		where: 'account',
+		default: [] as string[],
+	},
 }));
 
 // TODO: 他のタブと永続化されたstateを同期
diff --git a/packages/misskey-js/package.json b/packages/misskey-js/package.json
index 24207233d..6d6034648 100644
--- a/packages/misskey-js/package.json
+++ b/packages/misskey-js/package.json
@@ -1,7 +1,7 @@
 {
 	"type": "module",
 	"name": "misskey-js",
-	"version": "2024.5.0-host.3a",
+	"version": "2024.5.0-host.3b",
 	"description": "Misskey SDK for JavaScript",
 	"types": "./built/dts/index.d.ts",
 	"exports": {