diff --git a/frontend/src/components/FinalMaskForm.vue b/frontend/src/components/FinalMaskForm.vue
new file mode 100644
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+++ b/frontend/src/components/FinalMaskForm.vue
@@ -0,0 +1,544 @@
+<script setup>
+import { computed } from 'vue';
+import { DeleteOutlined, PlusOutlined, ReloadOutlined } from '@ant-design/icons-vue';
+import { RandomUtil } from '@/utils';
+import { Protocols } from '@/models/inbound.js';
+
+// Mirrors web/html/form/stream/stream_finalmask.html. Used by both the
+// inbound and outbound modals — they share the same StreamSettings
+// shape (`stream.finalmask`, `stream.addTcpMask()`, etc.) so a single
+// component handles both. The host modal passes its protocol through
+// so we know whether to show only the Hysteria-specific UDP types.
+const props = defineProps({
+  stream: { type: Object, required: true },
+  protocol: { type: String, default: '' },
+});
+
+const isHysteria = computed(() => props.protocol === Protocols.HYSTERIA);
+const network = computed(() => props.stream?.network || '');
+
+const showTcp = computed(() => ['raw', 'tcp', 'httpupgrade', 'ws', 'grpc', 'xhttp'].includes(network.value));
+const showUdp = computed(() => isHysteria.value || network.value === 'kcp');
+const showQuic = computed(() => isHysteria.value || network.value === 'xhttp');
+
+// Reset the per-row settings shape when the user picks a different
+// type — mirrors the legacy `mask._getDefaultSettings(type, {})` call.
+function changeMaskType(mask, type) {
+  mask.type = type;
+  mask.settings = mask._getDefaultSettings(type, {});
+}
+
+// Special case from the legacy form: switching a UDP mask to xdns
+// shrinks the kcp MTU; everything else needs the default 1350.
+function changeUdpMaskType(mask, type) {
+  changeMaskType(mask, type);
+  if (network.value === 'kcp' && props.stream.kcp) {
+    props.stream.kcp.mtu = type === 'xdns' ? 900 : 1350;
+  }
+}
+
+// header-custom and noise rows share the same per-item shape — the
+// type select rewires the packet field. Pulled out so the click
+// handlers in the template stay readable.
+function changeItemType(item, type) {
+  item.type = type;
+  if (type === 'base64') item.packet = RandomUtil.randomBase64();
+  else if (type === 'array') { item.rand = 0; item.packet = []; }
+  else item.packet = '';
+}
+
+function addUdpMaskWithDefault() {
+  const def = isHysteria.value ? 'salamander' : 'mkcp-aes128gcm';
+  props.stream.addUdpMask(def);
+}
+
+function newClientServerItem() {
+  return { delay: 0, rand: 0, randRange: '0-255', type: 'array', packet: [] };
+}
+
+function newUdpClientServerItem() {
+  return { rand: 0, randRange: '0-255', type: 'array', packet: [] };
+}
+
+function newNoiseItem() {
+  return { rand: '1-8192', randRange: '0-255', type: 'array', packet: [], delay: '10-20' };
+}
+</script>
+
+<template>
+  <a-form
+    v-if="showTcp || showUdp || showQuic"
+    :colon="false"
+    :label-col="{ md: { span: 8 } }"
+    :wrapper-col="{ md: { span: 14 } }"
+  >
+    <a-divider :style="{ margin: '5px 0 0' }" />
+
+    <!-- ============================== TCP MASKS ============================== -->
+    <template v-if="showTcp">
+      <a-form-item label="TCP Masks">
+        <a-button type="primary" size="small" @click="stream.addTcpMask('fragment')">
+          <template #icon><PlusOutlined /></template>
+        </a-button>
+      </a-form-item>
+
+      <template v-for="(mask, mIdx) in (stream.finalmask.tcp || [])" :key="`tcp-${mIdx}`">
+        <a-divider :style="{ margin: '0' }">
+          TCP Mask {{ mIdx + 1 }}
+          <DeleteOutlined
+            :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+            @click="stream.delTcpMask(mIdx)"
+          />
+        </a-divider>
+
+        <a-form-item label="Type">
+          <a-select :value="mask.type" @change="(t) => changeMaskType(mask, t)">
+            <a-select-option value="fragment">Fragment</a-select-option>
+            <a-select-option value="header-custom">Header Custom</a-select-option>
+            <a-select-option value="sudoku">Sudoku</a-select-option>
+          </a-select>
+        </a-form-item>
+
+        <!-- Fragment -->
+        <template v-if="mask.type === 'fragment'">
+          <a-form-item label="Packets">
+            <a-select v-model:value="mask.settings.packets">
+              <a-select-option value="tlshello">tlshello</a-select-option>
+              <a-select-option value="1-3">1-3</a-select-option>
+              <a-select-option value="1-5">1-5</a-select-option>
+            </a-select>
+          </a-form-item>
+          <a-form-item label="Length">
+            <a-input v-model:value="mask.settings.length" placeholder="e.g. 100-200" />
+          </a-form-item>
+          <a-form-item label="Delay">
+            <a-input v-model:value="mask.settings.delay" placeholder="e.g. 10-20" />
+          </a-form-item>
+          <a-form-item label="Max Split">
+            <a-input v-model:value="mask.settings.maxSplit" placeholder="e.g. 3-6" />
+          </a-form-item>
+        </template>
+
+        <!-- Sudoku -->
+        <template v-if="mask.type === 'sudoku'">
+          <a-form-item label="Password">
+            <a-input v-model:value="mask.settings.password" placeholder="Obfuscation password" />
+          </a-form-item>
+          <a-form-item label="ASCII">
+            <a-input v-model:value="mask.settings.ascii" placeholder="ASCII" />
+          </a-form-item>
+          <a-form-item label="Custom Table">
+            <a-input v-model:value="mask.settings.customTable" placeholder="Custom Table" />
+          </a-form-item>
+          <a-form-item label="Custom Tables">
+            <a-input v-model:value="mask.settings.customTables" placeholder="Custom Tables" />
+          </a-form-item>
+          <a-form-item label="Padding Min">
+            <a-input-number v-model:value="mask.settings.paddingMin" :min="0" />
+          </a-form-item>
+          <a-form-item label="Padding Max">
+            <a-input-number v-model:value="mask.settings.paddingMax" :min="0" />
+          </a-form-item>
+        </template>
+
+        <!-- Header Custom — clients/servers as 2D groups -->
+        <template v-if="mask.type === 'header-custom'">
+          <!-- Clients -->
+          <a-form-item label="Clients">
+            <a-button type="primary" size="small" @click="mask.settings.clients.push([newClientServerItem()])">
+              <template #icon><PlusOutlined /></template>
+            </a-button>
+          </a-form-item>
+          <template v-for="(group, gi) in mask.settings.clients" :key="`tcp-cg-${mIdx}-${gi}`">
+            <a-divider :style="{ margin: '0' }">
+              Clients Group {{ gi + 1 }}
+              <DeleteOutlined
+                :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+                @click="mask.settings.clients.splice(gi, 1)"
+              />
+            </a-divider>
+            <template v-for="(item, ii) in group" :key="`tcp-ci-${mIdx}-${gi}-${ii}`">
+              <a-form-item label="Type">
+                <a-select :value="item.type" @change="(t) => changeItemType(item, t)">
+                  <a-select-option value="array">Array</a-select-option>
+                  <a-select-option value="str">String</a-select-option>
+                  <a-select-option value="hex">Hex</a-select-option>
+                  <a-select-option value="base64">Base64</a-select-option>
+                </a-select>
+              </a-form-item>
+              <a-form-item label="Delay (ms)">
+                <a-input-number v-model:value="item.delay" :min="0" />
+              </a-form-item>
+              <template v-if="item.type === 'array'">
+                <a-form-item label="Rand">
+                  <a-input-number v-model:value="item.rand" :min="0" />
+                </a-form-item>
+                <a-form-item label="Rand Range">
+                  <a-input v-model:value="item.randRange" placeholder="0-255" />
+                </a-form-item>
+              </template>
+              <a-form-item v-else label="Packet">
+                <a-input-group v-if="item.type === 'base64'" compact>
+                  <a-input
+                    v-model:value="item.packet"
+                    placeholder="binary data"
+                    :style="{ width: 'calc(100% - 32px)' }"
+                  />
+                  <a-button @click="item.packet = RandomUtil.randomBase64()">
+                    <template #icon><ReloadOutlined /></template>
+                  </a-button>
+                </a-input-group>
+                <a-input v-else v-model:value="item.packet" placeholder="binary data" />
+              </a-form-item>
+            </template>
+          </template>
+
+          <!-- Servers -->
+          <a-form-item label="Servers">
+            <a-button type="primary" size="small" @click="mask.settings.servers.push([newClientServerItem()])">
+              <template #icon><PlusOutlined /></template>
+            </a-button>
+          </a-form-item>
+          <template v-for="(group, gi) in mask.settings.servers" :key="`tcp-sg-${mIdx}-${gi}`">
+            <a-divider :style="{ margin: '0' }">
+              Servers Group {{ gi + 1 }}
+              <DeleteOutlined
+                :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+                @click="mask.settings.servers.splice(gi, 1)"
+              />
+            </a-divider>
+            <template v-for="(item, ii) in group" :key="`tcp-si-${mIdx}-${gi}-${ii}`">
+              <a-form-item label="Type">
+                <a-select :value="item.type" @change="(t) => changeItemType(item, t)">
+                  <a-select-option value="array">Array</a-select-option>
+                  <a-select-option value="str">String</a-select-option>
+                  <a-select-option value="hex">Hex</a-select-option>
+                  <a-select-option value="base64">Base64</a-select-option>
+                </a-select>
+              </a-form-item>
+              <a-form-item label="Delay (ms)">
+                <a-input-number v-model:value="item.delay" :min="0" />
+              </a-form-item>
+              <template v-if="item.type === 'array'">
+                <a-form-item label="Rand">
+                  <a-input-number v-model:value="item.rand" :min="0" />
+                </a-form-item>
+                <a-form-item label="Rand Range">
+                  <a-input v-model:value="item.randRange" placeholder="0-255" />
+                </a-form-item>
+              </template>
+              <a-form-item v-else label="Packet">
+                <a-input-group v-if="item.type === 'base64'" compact>
+                  <a-input
+                    v-model:value="item.packet"
+                    placeholder="binary data"
+                    :style="{ width: 'calc(100% - 32px)' }"
+                  />
+                  <a-button @click="item.packet = RandomUtil.randomBase64()">
+                    <template #icon><ReloadOutlined /></template>
+                  </a-button>
+                </a-input-group>
+                <a-input v-else v-model:value="item.packet" placeholder="binary data" />
+              </a-form-item>
+            </template>
+          </template>
+        </template>
+      </template>
+    </template>
+
+    <!-- ============================== UDP MASKS ============================== -->
+    <template v-if="showUdp">
+      <a-form-item label="UDP Masks">
+        <a-button type="primary" size="small" @click="addUdpMaskWithDefault">
+          <template #icon><PlusOutlined /></template>
+        </a-button>
+      </a-form-item>
+
+      <template v-for="(mask, mIdx) in (stream.finalmask.udp || [])" :key="`udp-${mIdx}`">
+        <a-divider :style="{ margin: '0' }">
+          UDP Mask {{ mIdx + 1 }}
+          <DeleteOutlined
+            :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+            @click="stream.delUdpMask(mIdx)"
+          />
+        </a-divider>
+
+        <a-form-item label="Type">
+          <a-select :value="mask.type" @change="(t) => changeUdpMaskType(mask, t)">
+            <template v-if="isHysteria">
+              <a-select-option value="salamander">Salamander (Hysteria2)</a-select-option>
+            </template>
+            <template v-else>
+              <a-select-option value="mkcp-aes128gcm">mKCP AES-128-GCM</a-select-option>
+              <a-select-option value="header-dns">Header DNS</a-select-option>
+              <a-select-option value="header-dtls">Header DTLS 1.2</a-select-option>
+              <a-select-option value="header-srtp">Header SRTP</a-select-option>
+              <a-select-option value="header-utp">Header uTP</a-select-option>
+              <a-select-option value="header-wechat">Header WeChat Video</a-select-option>
+              <a-select-option value="header-wireguard">Header WireGuard</a-select-option>
+              <a-select-option value="mkcp-original">mKCP Original</a-select-option>
+              <a-select-option value="xdns">xDNS</a-select-option>
+              <a-select-option value="xicmp">xICMP</a-select-option>
+              <a-select-option value="header-custom">Header Custom</a-select-option>
+              <a-select-option value="noise">Noise</a-select-option>
+            </template>
+          </a-select>
+        </a-form-item>
+
+        <a-form-item v-if="['mkcp-aes128gcm', 'salamander'].includes(mask.type)" label="Password">
+          <a-input v-model:value="mask.settings.password" placeholder="Obfuscation password" />
+        </a-form-item>
+        <a-form-item v-if="mask.type === 'header-dns'" label="Domain">
+          <a-input v-model:value="mask.settings.domain" placeholder="e.g., www.example.com" />
+        </a-form-item>
+        <a-form-item v-if="mask.type === 'xdns'" label="Domains">
+          <a-select
+            v-model:value="mask.settings.domains"
+            mode="tags"
+            :style="{ width: '100%' }"
+            :token-separators="[',']"
+            placeholder="e.g., www.example.com"
+          />
+        </a-form-item>
+
+        <!-- Noise -->
+        <template v-if="mask.type === 'noise'">
+          <a-form-item label="Reset">
+            <a-input-number v-model:value="mask.settings.reset" :min="0" />
+          </a-form-item>
+          <a-form-item label="Noise">
+            <a-button type="primary" size="small" @click="mask.settings.noise.push(newNoiseItem())">
+              <template #icon><PlusOutlined /></template>
+            </a-button>
+          </a-form-item>
+          <template v-for="(n, ni) in mask.settings.noise" :key="`udp-noise-${mIdx}-${ni}`">
+            <a-divider :style="{ margin: '0' }">
+              Noise {{ ni + 1 }}
+              <DeleteOutlined
+                :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+                @click="mask.settings.noise.splice(ni, 1)"
+              />
+            </a-divider>
+            <a-form-item label="Type">
+              <a-select :value="n.type" @change="(t) => changeItemType(n, t)">
+                <a-select-option value="array">Array</a-select-option>
+                <a-select-option value="str">String</a-select-option>
+                <a-select-option value="hex">Hex</a-select-option>
+                <a-select-option value="base64">Base64</a-select-option>
+              </a-select>
+            </a-form-item>
+            <template v-if="n.type === 'array'">
+              <a-form-item label="Rand">
+                <a-input v-model:value="n.rand" placeholder="0 or 1-8192" />
+              </a-form-item>
+              <a-form-item label="Rand Range">
+                <a-input v-model:value="n.randRange" placeholder="0-255" />
+              </a-form-item>
+            </template>
+            <a-form-item v-else label="Packet">
+              <a-input-group v-if="n.type === 'base64'" compact>
+                <a-input
+                  v-model:value="n.packet"
+                  placeholder="binary data"
+                  :style="{ width: 'calc(100% - 32px)' }"
+                />
+                <a-button @click="n.packet = RandomUtil.randomBase64()">
+                  <template #icon><ReloadOutlined /></template>
+                </a-button>
+              </a-input-group>
+              <a-input v-else v-model:value="n.packet" placeholder="binary data" />
+            </a-form-item>
+            <a-form-item label="Delay">
+              <a-input v-model:value="n.delay" placeholder="10-20" />
+            </a-form-item>
+          </template>
+        </template>
+
+        <!-- Header Custom (UDP) — flat client/server lists -->
+        <template v-if="mask.type === 'header-custom'">
+          <a-form-item label="Client">
+            <a-button type="primary" size="small" @click="mask.settings.client.push(newUdpClientServerItem())">
+              <template #icon><PlusOutlined /></template>
+            </a-button>
+          </a-form-item>
+          <template v-for="(c, ci) in mask.settings.client" :key="`udp-c-${mIdx}-${ci}`">
+            <a-divider :style="{ margin: '0' }">
+              Client {{ ci + 1 }}
+              <DeleteOutlined
+                :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+                @click="mask.settings.client.splice(ci, 1)"
+              />
+            </a-divider>
+            <a-form-item label="Type">
+              <a-select :value="c.type" @change="(t) => changeItemType(c, t)">
+                <a-select-option value="array">Array</a-select-option>
+                <a-select-option value="str">String</a-select-option>
+                <a-select-option value="hex">Hex</a-select-option>
+                <a-select-option value="base64">Base64</a-select-option>
+              </a-select>
+            </a-form-item>
+            <template v-if="c.type === 'array'">
+              <a-form-item label="Rand">
+                <a-input-number v-model:value="c.rand" />
+              </a-form-item>
+              <a-form-item label="Rand Range">
+                <a-input v-model:value="c.randRange" placeholder="0-255" />
+              </a-form-item>
+            </template>
+            <a-form-item v-else label="Packet">
+              <a-input-group v-if="c.type === 'base64'" compact>
+                <a-input
+                  v-model:value="c.packet"
+                  placeholder="binary data"
+                  :style="{ width: 'calc(100% - 32px)' }"
+                />
+                <a-button @click="c.packet = RandomUtil.randomBase64()">
+                  <template #icon><ReloadOutlined /></template>
+                </a-button>
+              </a-input-group>
+              <a-input v-else v-model:value="c.packet" placeholder="binary data" />
+            </a-form-item>
+          </template>
+
+          <a-divider :style="{ margin: '0' }" />
+          <a-form-item label="Server">
+            <a-button type="primary" size="small" @click="mask.settings.server.push(newUdpClientServerItem())">
+              <template #icon><PlusOutlined /></template>
+            </a-button>
+          </a-form-item>
+          <template v-for="(s, si) in mask.settings.server" :key="`udp-s-${mIdx}-${si}`">
+            <a-divider :style="{ margin: '0' }">
+              Server {{ si + 1 }}
+              <DeleteOutlined
+                :style="{ color: 'rgb(255, 77, 79)', cursor: 'pointer', marginLeft: '8px' }"
+                @click="mask.settings.server.splice(si, 1)"
+              />
+            </a-divider>
+            <a-form-item label="Type">
+              <a-select :value="s.type" @change="(t) => changeItemType(s, t)">
+                <a-select-option value="array">Array</a-select-option>
+                <a-select-option value="str">String</a-select-option>
+                <a-select-option value="hex">Hex</a-select-option>
+                <a-select-option value="base64">Base64</a-select-option>
+              </a-select>
+            </a-form-item>
+            <template v-if="s.type === 'array'">
+              <a-form-item label="Rand">
+                <a-input-number v-model:value="s.rand" />
+              </a-form-item>
+              <a-form-item label="Rand Range">
+                <a-input v-model:value="s.randRange" placeholder="0-255" />
+              </a-form-item>
+            </template>
+            <a-form-item v-else label="Packet">
+              <a-input-group v-if="s.type === 'base64'" compact>
+                <a-input
+                  v-model:value="s.packet"
+                  placeholder="binary data"
+                  :style="{ width: 'calc(100% - 32px)' }"
+                />
+                <a-button @click="s.packet = RandomUtil.randomBase64()">
+                  <template #icon><ReloadOutlined /></template>
+                </a-button>
+              </a-input-group>
+              <a-input v-else v-model:value="s.packet" placeholder="binary data" />
+            </a-form-item>
+          </template>
+        </template>
+
+        <!-- xICMP -->
+        <template v-if="mask.type === 'xicmp'">
+          <a-form-item label="IP">
+            <a-input v-model:value="mask.settings.ip" placeholder="0.0.0.0" />
+          </a-form-item>
+          <a-form-item label="ID">
+            <a-input-number v-model:value="mask.settings.id" :min="0" />
+          </a-form-item>
+        </template>
+      </template>
+    </template>
+
+    <!-- ============================== QUIC PARAMS ============================== -->
+    <template v-if="showQuic">
+      <a-form-item label="QUIC Params">
+        <a-switch v-model:checked="stream.finalmask.enableQuicParams" />
+      </a-form-item>
+      <template v-if="stream.finalmask.enableQuicParams && stream.finalmask.quicParams">
+        <a-form-item label="Congestion">
+          <a-select v-model:value="stream.finalmask.quicParams.congestion">
+            <a-select-option value="reno">Reno</a-select-option>
+            <a-select-option value="bbr">BBR</a-select-option>
+            <a-select-option value="brutal">Brutal</a-select-option>
+            <a-select-option value="force-brutal">Force Brutal</a-select-option>
+          </a-select>
+        </a-form-item>
+        <a-form-item label="Debug">
+          <a-switch v-model:checked="stream.finalmask.quicParams.debug" />
+        </a-form-item>
+        <template v-if="['brutal', 'force-brutal'].includes(stream.finalmask.quicParams.congestion)">
+          <a-form-item label="Brutal Up">
+            <a-input v-model:value="stream.finalmask.quicParams.brutalUp" placeholder="65537" />
+          </a-form-item>
+          <a-form-item label="Brutal Down">
+            <a-input v-model:value="stream.finalmask.quicParams.brutalDown" placeholder="65537" />
+          </a-form-item>
+        </template>
+        <a-form-item label="UDP Hop">
+          <a-switch v-model:checked="stream.finalmask.quicParams.hasUdpHop" />
+        </a-form-item>
+        <template v-if="stream.finalmask.quicParams.hasUdpHop && stream.finalmask.quicParams.udpHop">
+          <a-form-item label="Hop Ports">
+            <a-input v-model:value="stream.finalmask.quicParams.udpHop.ports" placeholder="e.g. 20000-50000" />
+          </a-form-item>
+          <a-form-item label="Hop Interval (s)">
+            <a-input-number v-model:value="stream.finalmask.quicParams.udpHop.interval" :min="5" />
+          </a-form-item>
+        </template>
+        <a-form-item label="Max Idle Timeout (s)">
+          <a-input-number v-model:value="stream.finalmask.quicParams.maxIdleTimeout" :min="4" :max="120" />
+        </a-form-item>
+        <a-form-item label="Keep Alive Period (s)">
+          <a-input-number v-model:value="stream.finalmask.quicParams.keepAlivePeriod" :min="2" :max="60" />
+        </a-form-item>
+        <a-form-item label="Disable Path MTU Dis">
+          <a-switch v-model:checked="stream.finalmask.quicParams.disablePathMTUDiscovery" />
+        </a-form-item>
+        <a-form-item label="Max Incoming Streams">
+          <a-input-number
+            v-model:value="stream.finalmask.quicParams.maxIncomingStreams"
+            :min="8"
+            placeholder="1024 = default"
+          />
+        </a-form-item>
+        <a-form-item label="Init Stream Window">
+          <a-input-number
+            v-model:value="stream.finalmask.quicParams.initStreamReceiveWindow"
+            :min="16384"
+            placeholder="8388608 = default"
+          />
+        </a-form-item>
+        <a-form-item label="Max Stream Window">
+          <a-input-number
+            v-model:value="stream.finalmask.quicParams.maxStreamReceiveWindow"
+            :min="16384"
+            placeholder="8388608 = default"
+          />
+        </a-form-item>
+        <a-form-item label="Init Conn Window">
+          <a-input-number
+            v-model:value="stream.finalmask.quicParams.initConnectionReceiveWindow"
+            :min="16384"
+            placeholder="20971520 = default"
+          />
+        </a-form-item>
+        <a-form-item label="Max Conn Window">
+          <a-input-number
+            v-model:value="stream.finalmask.quicParams.maxConnectionReceiveWindow"
+            :min="16384"
+            placeholder="20971520 = default"
+          />
+        </a-form-item>
+      </template>
+    </template>
+  </a-form>
+</template>
diff --git a/frontend/src/pages/inbounds/InboundFormModal.vue b/frontend/src/pages/inbounds/InboundFormModal.vue
index e8f54af6..fb38f197 100644
--- a/frontend/src/pages/inbounds/InboundFormModal.vue
+++ b/frontend/src/pages/inbounds/InboundFormModal.vue
@@ -29,6 +29,7 @@ import {
   MODE_OPTION,
 } from '@/models/inbound.js';
 import { DBInbound } from '@/models/dbinbound.js';
+import FinalMaskForm from '@/components/FinalMaskForm.vue';
 
 const { t } = useI18n();
 
@@ -1509,6 +1510,9 @@ watch(
             </a-form-item>
           </template>
         </a-form>
+
+        <!-- ====== FinalMask (TCP/UDP masks + QUIC params) ====== -->
+        <FinalMaskForm :stream="inbound.stream" :protocol="protocol" />
       </a-tab-pane>
 
       <!-- ============================== SNIFFING ============================== -->
@@ -1557,7 +1561,7 @@ watch(
         <a-alert
           type="info"
           show-icon
-          message="Edit raw stream JSON to access KCP / XHTTP / finalmask transports we don't yet have dedicated UI for."
+          message="Edit raw stream JSON to access advanced fields we don't yet expose through the form."
           class="mb-12"
         />
         <a-form layout="vertical">
diff --git a/frontend/src/pages/xray/OutboundFormModal.vue b/frontend/src/pages/xray/OutboundFormModal.vue
index bd4f3eb2..080b9400 100644
--- a/frontend/src/pages/xray/OutboundFormModal.vue
+++ b/frontend/src/pages/xray/OutboundFormModal.vue
@@ -20,6 +20,7 @@ import {
   MODE_OPTION,
   DNSRuleActions,
 } from '@/models/outbound.js';
+import FinalMaskForm from '@/components/FinalMaskForm.vue';
 
 const { t } = useI18n();
 
@@ -27,7 +28,7 @@ const { t } = useI18n();
 // web/html/form/outbound.html. Covers every protocol + transport
 // combination the legacy panel exposes; the JSON tab still lets
 // power-users hand-edit fields the structured form doesn't surface
-// (deep finalmask/quic tuning, reverse-sniffing, etc.).
+// (reverse-sniffing, exotic outbound DNS rules, etc.).
 
 const props = defineProps({
   open: { type: Boolean, default: false },
@@ -740,6 +741,9 @@ function regenerateWgKeys() {
             </template>
           </template>
         </a-form>
+
+        <!-- ============== FinalMask (TCP/UDP masks + QUIC params) ============== -->
+        <FinalMaskForm v-if="outbound.stream" :stream="outbound.stream" :protocol="proto" />
       </a-tab-pane>
 
       <!-- ============================== JSON ============================== -->