diff --git a/package.json b/package.json
index 5bcea8385..9062fbbec 100644
--- a/package.json
+++ b/package.json
@@ -117,6 +117,7 @@
 		"aws-sdk": "2.840.0",
 		"bcryptjs": "2.4.3",
 		"blurhash": "1.1.3",
+		"broadcast-channel": "3.4.1",
 		"bull": "3.20.1",
 		"cafy": "15.2.1",
 		"cbor": "6.0.1",
diff --git a/src/client/account.ts b/src/client/account.ts
index 05faeb322..e5b451cf1 100644
--- a/src/client/account.ts
+++ b/src/client/account.ts
@@ -1,6 +1,7 @@
 import { reactive } from 'vue';
 import { apiUrl } from '@/config';
 import { waiting } from '@/os';
+import { unisonReload } from '@/scripts/unison-reload';
 
 // TODO: 他のタブと永続化されたstateを同期
 
@@ -75,7 +76,7 @@ export async function login(token: Account['token']) {
 	const me = await fetchAccount(token);
 	localStorage.setItem('account', JSON.stringify(me));
 	addAccount(me.id, token);
-	location.reload();
+	unisonReload();
 }
 
 // このファイルに書きたくないけどここに書かないと何故かVeturが認識しない
diff --git a/src/client/init.ts b/src/client/init.ts
index 146c54fa6..c60b25359 100644
--- a/src/client/init.ts
+++ b/src/client/init.ts
@@ -59,6 +59,7 @@ import { search } from '@/scripts/search';
 import { isMobile } from '@/scripts/is-mobile';
 import { getThemes } from '@/theme-store';
 import { initializeSw } from '@/scripts/initialize-sw';
+import { reloadChannel } from '@/scripts/unison-reload';
 
 console.info(`Misskey v${version}`);
 
@@ -106,6 +107,9 @@ if (defaultStore.state.reportError && !_DEV_) {
 // タッチデバイスでCSSの:hoverを機能させる
 document.addEventListener('touchend', () => {}, { passive: true });
 
+// 一斉リロード
+reloadChannel.addEventListener('message', () => location.reload());
+
 //#region SEE: https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
 // TODO: いつの日にか消したい
 const vh = window.innerHeight * 0.01;
diff --git a/src/client/pages/settings/deck.vue b/src/client/pages/settings/deck.vue
index 30d36d4a0..cbc5edca9 100644
--- a/src/client/pages/settings/deck.vue
+++ b/src/client/pages/settings/deck.vue
@@ -40,6 +40,7 @@ import FormBase from '@/components/form/base.vue';
 import FormGroup from '@/components/form/group.vue';
 import { deckStore } from '@/ui/deck/deck-store';
 import * as os from '@/os';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export default defineComponent({
 	components: {
@@ -81,7 +82,7 @@ export default defineComponent({
 			});
 			if (canceled) return;
 
-			location.reload();
+			unisonReload();
 		}
 	},
 
@@ -99,7 +100,7 @@ export default defineComponent({
 			});
 			if (canceled) return;
 			this.profile = name;
-			location.reload();
+			unisonReload();
 		}
 	}
 });
diff --git a/src/client/pages/settings/general.vue b/src/client/pages/settings/general.vue
index 9314e14da..0e741d474 100644
--- a/src/client/pages/settings/general.vue
+++ b/src/client/pages/settings/general.vue
@@ -96,6 +96,7 @@ import { langs } from '@/config';
 import { defaultStore } from '@/store';
 import { ColdDeviceStorage } from '@/store';
 import * as os from '@/os';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export default defineComponent({
 	components: {
@@ -200,7 +201,7 @@ export default defineComponent({
 			});
 			if (canceled) return;
 
-			location.reload();
+			unisonReload();
 		}
 	}
 });
diff --git a/src/client/pages/settings/index.vue b/src/client/pages/settings/index.vue
index 54bf56930..1b4aa70ec 100644
--- a/src/client/pages/settings/index.vue
+++ b/src/client/pages/settings/index.vue
@@ -52,6 +52,7 @@ import FormBase from '@/components/form/base.vue';
 import FormButton from '@/components/form/button.vue';
 import { scroll } from '@/scripts/scroll';
 import { signout } from '@/account';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export default defineComponent({
 	components: {
@@ -160,7 +161,7 @@ export default defineComponent({
 			clear: () => {
 				localStorage.removeItem('locale');
 				localStorage.removeItem('theme');
-				location.reload();
+				unisonReload();
 			},
 			faPalette, faPlug, faUser, faListUl, faLock, faLaugh, faCommentSlash, faMusic, faBell, faCogs, faEllipsisH, faBan, faShareAlt, faLockOpen, faKey, faBoxes, faEnvelope, faCloud,
 		};
diff --git a/src/client/pages/settings/other.vue b/src/client/pages/settings/other.vue
index c6ec9f6c0..c0b962509 100644
--- a/src/client/pages/settings/other.vue
+++ b/src/client/pages/settings/other.vue
@@ -40,6 +40,7 @@ import * as os from '@/os';
 import { debug } from '@/config';
 import { defaultStore } from '@/store';
 import { signout } from '@/account';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export default defineComponent({
 	components: {
@@ -76,7 +77,7 @@ export default defineComponent({
 		changeDebug(v) {
 			console.log(v);
 			localStorage.setItem('debug', v.toString());
-			location.reload();
+			unisonReload();
 		},
 
 		onChangeInjectFeaturedNote(v) {
diff --git a/src/client/pages/settings/plugin.install.vue b/src/client/pages/settings/plugin.install.vue
index 0873f28d2..0f6393f73 100644
--- a/src/client/pages/settings/plugin.install.vue
+++ b/src/client/pages/settings/plugin.install.vue
@@ -28,6 +28,7 @@ import FormButton from '@/components/form/button.vue';
 import MkInfo from '@/components/ui/info.vue';
 import * as os from '@/os';
 import { ColdDeviceStorage } from '@/store';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export default defineComponent({
 	components: {
@@ -138,7 +139,7 @@ export default defineComponent({
 			os.success();
 
 			this.$nextTick(() => {
-				location.reload();
+				unisonReload();
 			});
 		},
 	}
diff --git a/src/client/pages/settings/plugin.manage.vue b/src/client/pages/settings/plugin.manage.vue
index 88eeef2bb..5fd93d8b7 100644
--- a/src/client/pages/settings/plugin.manage.vue
+++ b/src/client/pages/settings/plugin.manage.vue
@@ -76,7 +76,7 @@ export default defineComponent({
 			ColdDeviceStorage.set('plugins', this.plugins.filter(x => x.id !== plugin.id));
 			os.success();
 			this.$nextTick(() => {
-				location.reload();
+				unisonReload();
 			});
 		},
 
diff --git a/src/client/scripts/unison-reload.ts b/src/client/scripts/unison-reload.ts
new file mode 100644
index 000000000..92556aefa
--- /dev/null
+++ b/src/client/scripts/unison-reload.ts
@@ -0,0 +1,10 @@
+// SafariがBroadcastChannel未実装なのでライブラリを使う
+import { BroadcastChannel } from 'broadcast-channel';
+
+export const reloadChannel = new BroadcastChannel<'reload'>('reload');
+
+// BroadcastChannelを用いて、クライアントが一斉にreloadするようにします。
+export function unisonReload() {
+	reloadChannel.postMessage('reload');
+	location.reload();
+}
diff --git a/src/client/sidebar.ts b/src/client/sidebar.ts
index d7822e9e0..3d23d2f1c 100644
--- a/src/client/sidebar.ts
+++ b/src/client/sidebar.ts
@@ -5,6 +5,7 @@ import { search } from '@/scripts/search';
 import * as os from '@/os';
 import { i18n } from '@/i18n';
 import { $i } from './account';
+import { unisonReload } from '@/scripts/unison-reload';
 
 export const sidebarDef = {
 	notifications: {
@@ -133,13 +134,13 @@ export const sidebarDef = {
 				text: i18n.locale.default,
 				action: () => {
 					localStorage.setItem('ui', 'default');
-					location.reload();
+					unisonReload();
 				}
 			}, {
 				text: i18n.locale.deck,
 				action: () => {
 					localStorage.setItem('ui', 'deck');
-					location.reload();
+					unisonReload();
 				}
 			}, {
 				text: 'Chat (β)',
@@ -151,7 +152,7 @@ export const sidebarDef = {
 				text: i18n.locale.desktop + ' (β)',
 				action: () => {
 					localStorage.setItem('ui', 'desktop');
-					location.reload();
+					unisonReload();
 				}
 			}], ev.currentTarget || ev.target);
 		},
diff --git a/yarn.lock b/yarn.lock
index e258eeb1a..783e17d4a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -59,6 +59,13 @@
     "@babel/helper-plugin-utils" "^7.12.13"
     semver "^5.5.1"
 
+"@babel/runtime@^7.6.2", "@babel/runtime@^7.7.2":
+  version "7.12.13"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.12.13.tgz#0a21452352b02542db0ffb928ac2d3ca7cb6d66d"
+  integrity sha512-8+3UMPBrjFa/6TtKi/7sehPKqfAm4g6K+YQjyyFOLUTxzOngcRZTlAVY8sc2CORJYqdHQY8gRPHmn+qo15rCBw==
+  dependencies:
+    regenerator-runtime "^0.13.4"
+
 "@babel/types@^7.12.0", "@babel/types@^7.6.1":
   version "7.12.7"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.12.7.tgz#6039ff1e242640a29452c9ae572162ec9a8f5d13"
@@ -1868,6 +1875,11 @@ bcryptjs@2.4.3:
   resolved "https://registry.yarnpkg.com/bcryptjs/-/bcryptjs-2.4.3.tgz#9ab5627b93e60621ff7cdac5da9733027df1d0cb"
   integrity sha1-mrVie5PmBiH/fNrF2pczAn3x0Ms=
 
+big-integer@^1.6.16:
+  version "1.6.48"
+  resolved "https://registry.yarnpkg.com/big-integer/-/big-integer-1.6.48.tgz#8fd88bd1632cba4a1c8c3e3d7159f08bb95b4b9e"
+  integrity sha512-j51egjPa7/i+RdiRuJbPdJ2FIUYYPhvYLjzoYbcMMm62ooO6F94fETG4MTs46zPAF9Brs04OajboA/qTGuz78w==
+
 big.js@^5.2.2:
   version "5.2.2"
   resolved "https://registry.yarnpkg.com/big.js/-/big.js-5.2.2.tgz#65f0af382f578bcdc742bd9c281e9cb2d7768328"
@@ -1948,6 +1960,19 @@ braces@^3.0.1, braces@~3.0.2:
   dependencies:
     fill-range "^7.0.1"
 
+broadcast-channel@3.4.1:
+  version "3.4.1"
+  resolved "https://registry.yarnpkg.com/broadcast-channel/-/broadcast-channel-3.4.1.tgz#65b63068d0a5216026a19905c9b2d5e9adf0928a"
+  integrity sha512-VXYivSkuBeQY+pL5hNQQNvBdKKQINBAROm4G8lAbWQfOZ7Yn4TMcgLNlJyEqlkxy5G8JJBsI3VJ1u8FUTOROcg==
+  dependencies:
+    "@babel/runtime" "^7.7.2"
+    detect-node "^2.0.4"
+    js-sha3 "0.8.0"
+    microseconds "0.2.0"
+    nano-time "1.0.0"
+    rimraf "3.0.2"
+    unload "2.2.0"
+
 browser-process-hrtime@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/browser-process-hrtime/-/browser-process-hrtime-1.0.0.tgz#3c9b4b7d782c8121e56f10106d84c0d0ffc94626"
@@ -3374,6 +3399,11 @@ detect-libc@^1.0.3:
   resolved "https://registry.yarnpkg.com/detect-libc/-/detect-libc-1.0.3.tgz#fa137c4bd698edf55cd5cd02ac559f91a4c4ba9b"
   integrity sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=
 
+detect-node@^2.0.4:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/detect-node/-/detect-node-2.0.4.tgz#014ee8f8f669c5c58023da64b8179c083a28c46c"
+  integrity sha512-ZIzRpLJrOj7jjP2miAtgqIfmzbxa4ZOr5jJc601zklsfEx9oTzmmj2nVpIPRpNlRTIh8lc1kyViIY7BWSGNmKw==
+
 dicer@0.2.5:
   version "0.2.5"
   resolved "https://registry.yarnpkg.com/dicer/-/dicer-0.2.5.tgz#5996c086bb33218c812c090bddc09cd12facb70f"
@@ -5554,6 +5584,11 @@ js-beautify@^1.6.12:
     mkdirp "~1.0.3"
     nopt "^4.0.3"
 
+js-sha3@0.8.0:
+  version "0.8.0"
+  resolved "https://registry.yarnpkg.com/js-sha3/-/js-sha3-0.8.0.tgz#b9b7a5da73afad7dedd0f8c463954cbde6818840"
+  integrity sha512-gF1cRrHhIzNfToc802P800N8PpXS+evLLXfsVpowqmAFR9uwbi89WvXg2QspOmXL8QL86J4T1EpFu+yUkwJY3Q==
+
 js-stringify@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/js-stringify/-/js-stringify-1.0.2.tgz#1736fddfd9724f28a3682adc6230ae7e4e9679db"
@@ -6452,6 +6487,11 @@ micromatch@^4.0.0, micromatch@^4.0.2:
     braces "^3.0.1"
     picomatch "^2.0.5"
 
+microseconds@0.2.0:
+  version "0.2.0"
+  resolved "https://registry.yarnpkg.com/microseconds/-/microseconds-0.2.0.tgz#233b25f50c62a65d861f978a4a4f8ec18797dc39"
+  integrity sha512-n7DHHMjR1avBbSpsTBj6fmMGh2AGrifVV4e+WYc3Q9lO+xnSZ3NyhcBND3vzzatt05LFhoKFRxrIyklmLlUtyA==
+
 mime-db@1.44.0:
   version "1.44.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.44.0.tgz#fa11c5eb0aca1334b4233cb4d52f10c5a6272f92"
@@ -6644,6 +6684,13 @@ nan@^2.14.0, nan@^2.14.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.2.tgz#f5376400695168f4cc694ac9393d0c9585eeea19"
   integrity sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==
 
+nano-time@1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/nano-time/-/nano-time-1.0.0.tgz#b0554f69ad89e22d0907f7a12b0993a5d96137ef"
+  integrity sha1-sFVPaa2J4i0JB/ehKwmTpdlhN+8=
+  dependencies:
+    big-integer "^1.6.16"
+
 nanoid@3.1.20, nanoid@^3.1.20:
   version "3.1.20"
   resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
@@ -8702,7 +8749,7 @@ reflect-metadata@0.1.13, reflect-metadata@^0.1.13:
   resolved "https://registry.yarnpkg.com/reflect-metadata/-/reflect-metadata-0.1.13.tgz#67ae3ca57c972a2aa1642b10fe363fe32d49dc08"
   integrity sha512-Ts1Y/anZELhSsjMcU605fU9RE4Oi3p5ORujwbIKXfWa+0Zxs510Qrmrce5/Jowq3cHSZSJqBjypxmHarc+vEWg==
 
-regenerator-runtime@0.13.7:
+regenerator-runtime@0.13.7, regenerator-runtime@^0.13.4:
   version "0.13.7"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.7.tgz#cac2dacc8a1ea675feaabaeb8ae833898ae46f55"
   integrity sha512-a54FxoJDIr27pgf7IgeQGxmqUNYrcV338lf/6gH456HZ/PhX+5BcwHXG9ajESmwe6WRO0tAzRUrRmNONWgkrew==
@@ -10468,6 +10515,14 @@ unique-stream@^2.0.2:
     json-stable-stringify-without-jsonify "^1.0.1"
     through2-filter "^3.0.0"
 
+unload@2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/unload/-/unload-2.2.0.tgz#ccc88fdcad345faa06a92039ec0f80b488880ef7"
+  integrity sha512-B60uB5TNBLtN6/LsgAf3udH9saB5p7gqJwcFfbOEZ8BcBHnGwCf6G/TGiEqkRAxX7zAFIUtzdrXQSdL3Q/wqNA==
+  dependencies:
+    "@babel/runtime" "^7.6.2"
+    detect-node "^2.0.4"
+
 unpipe@1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/unpipe/-/unpipe-1.0.0.tgz#b2bf4ee8514aae6165b4817829d21b2ef49904ec"