diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index bccb82e51..f4c22d1ff 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -593,6 +593,10 @@ fillAbuseReportDescription: "通報理由の詳細を記入してください。
 abuseReported: "内容が送信されました。ご報告ありがとうございました。"
 send: "送信"
 abuseMarkAsResolved: "対応済みにする"
+openInNewTab: "新しいタブで開く"
+openInSideView: "サイドビューで開く"
+defaultNavigationBehaviour: "デフォルトのナビゲーション"
+editTheseSettingsMayBreakAccount: "これらの設定を編集するとアカウントが破損する可能性があります。"
 
 _serverDisconnectedBehavior:
   reload: "自動でリロード"
diff --git a/src/client/components/ui/textarea.vue b/src/client/components/ui/textarea.vue
index 6820be8a7..7d3250cc4 100644
--- a/src/client/components/ui/textarea.vue
+++ b/src/client/components/ui/textarea.vue
@@ -2,12 +2,13 @@
 <div class="adhpbeos" :class="{ focused, filled, tall, pre }">
 	<div class="input">
 		<span class="label" ref="label"><slot></slot></span>
-		<textarea ref="input"
+		<textarea ref="input" :class="{ code }"
 			:value="value"
 			:required="required"
 			:readonly="readonly"
 			:pattern="pattern"
 			:autocomplete="autocomplete"
+			:spellcheck="!code"
 			@input="onInput"
 			@focus="focused = true"
 			@blur="focused = false"
@@ -20,7 +21,6 @@
 
 <script lang="ts">
 import { defineComponent } from 'vue';
-import * as os from '@/os';
 
 export default defineComponent({
 	props: {
@@ -43,6 +43,10 @@ export default defineComponent({
 			type: String,
 			required: false
 		},
+		code: {
+			type: Boolean,
+			required: false
+		},
 		tall: {
 			type: Boolean,
 			required: false,
@@ -159,6 +163,11 @@ export default defineComponent({
 			outline: none;
 			box-shadow: none;
 			color: var(--fg);
+
+			&.code {
+				tab-size: 2;
+				font-family: Fira code, Fira Mono, Consolas, Menlo, Courier, monospace;
+			}
 		}
 	}
 
diff --git a/src/client/pages/settings/other.vue b/src/client/pages/settings/other.vue
index ebc564416..38c2e8adb 100644
--- a/src/client/pages/settings/other.vue
+++ b/src/client/pages/settings/other.vue
@@ -1,12 +1,17 @@
 <template>
-<div class="_section">
-	<div class="_card">
-		<div class="_content">
-			<MkSwitch v-model:value="$store.state.i.injectFeaturedNote" @update:value="onChangeInjectFeaturedNote">
-				{{ $t('showFeaturedNotesInTimeline') }}
-			</MkSwitch>
+<div>
+	<div class="_section">
+		<div class="_card">
+			<div class="_content">
+				<MkSwitch v-model:value="$store.state.i.injectFeaturedNote" @update:value="onChangeInjectFeaturedNote">
+					{{ $t('showFeaturedNotesInTimeline') }}
+				</MkSwitch>
+			</div>
 		</div>
 	</div>
+	<div class="_section">
+		<MkA to="/settings/regedit">RegEdit</MkA>
+	</div>
 </div>
 </template>
 
diff --git a/src/client/pages/settings/regedit.vue b/src/client/pages/settings/regedit.vue
new file mode 100644
index 000000000..fcc249bef
--- /dev/null
+++ b/src/client/pages/settings/regedit.vue
@@ -0,0 +1,77 @@
+<template>
+<div>
+	<div class="_section">
+		<MkInfo warn>{{ $t('editTheseSettingsMayBreakAccount') }}</MkInfo>
+	</div>
+	<div class="_section">
+		<div class="_title">Account</div>
+		<div class="_content">
+			<MkTextarea v-model:value="settings" code tall></MkTextarea>
+			<!--<MkButton @click="saveSettings">Save</MkButton>-->
+		</div>
+	</div>
+	<div class="_section">
+		<div class="_title">Device</div>
+		<div class="_content">
+			<MkTextarea v-model:value="deviceSettings" code tall></MkTextarea>
+			<MkButton @click="saveDeviceSettings">Save</MkButton>
+		</div>
+	</div>
+	<div class="_section">
+		<div class="_title">Device (per account)</div>
+		<div class="_content">
+			<MkTextarea v-model:value="deviceUserSettings" code tall></MkTextarea>
+			<MkButton @click="saveDeviceUserSettings">Save</MkButton>
+		</div>
+	</div>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent } from 'vue';
+import { faCode } from '@fortawesome/free-solid-svg-icons';
+import * as JSON5 from 'json5';
+import MkInfo from '@/components/ui/info.vue';
+import MkButton from '@/components/ui/button.vue';
+import MkTextarea from '@/components/ui/textarea.vue';
+import * as os from '@/os';
+
+export default defineComponent({
+	components: {
+		MkInfo, MkButton, MkTextarea
+	},
+
+	emits: ['info'],
+
+	data() {
+		return {
+			INFO: {
+				header: [{
+					title: 'RegEdit',
+					icon: faCode
+				}]
+			},
+
+			settings: JSON5.stringify(this.$store.state.settings, null, '\t'),
+			deviceSettings: JSON5.stringify(this.$store.state.device, null, '\t'),
+			deviceUserSettings: JSON5.stringify(this.$store.state.deviceUser, null, '\t'),
+		};
+	},
+
+	mounted() {
+		this.$emit('info', this.INFO);
+	},
+
+	methods: {
+		saveDeviceSettings() {
+			const obj = JSON5.parse(this.deviceSettings);
+			this.$store.commit('device/overwrite', obj);
+		},
+
+		saveDeviceUserSettings() {
+			const obj = JSON5.parse(this.deviceUserSettings);
+			this.$store.commit('deviceUser/overwrite', obj);
+		},
+	}
+});
+</script>
diff --git a/src/client/store.ts b/src/client/store.ts
index f1ad23e1f..e95191809 100644
--- a/src/client/store.ts
+++ b/src/client/store.ts
@@ -202,6 +202,15 @@ export const store = createStore({
 			state: defaultDeviceSettings,
 
 			mutations: {
+				overwrite(state, x) {
+					for (const k of Object.keys(state)) {
+						if (x[k] === undefined) delete state[k];
+					}
+					for (const k of Object.keys(x)) {
+						state[k] = x[k];
+					}
+				},
+
 				set(state, x: { key: string; value: any }) {
 					state[x.key] = x.value;
 				},
@@ -218,6 +227,15 @@ export const store = createStore({
 			state: defaultDeviceUserSettings,
 
 			mutations: {
+				overwrite(state, x) {
+					for (const k of Object.keys(state)) {
+						if (x[k] === undefined) delete state[k];
+					}
+					for (const k of Object.keys(x)) {
+						state[k] = x[k];
+					}
+				},
+
 				init(state, x) {
 					for (const [key, value] of Object.entries(defaultDeviceUserSettings)) {
 						if (x[key]) {