diff --git a/docs/audit/2026-06-11-global-floating-browser.md b/docs/audit/2026-06-11-global-floating-browser.md
index a6b84d63..d613f27a 100644
--- a/docs/audit/2026-06-11-global-floating-browser.md
+++ b/docs/audit/2026-06-11-global-floating-browser.md
@@ -41,4 +41,4 @@
 
 ## 验证
 
-浮动打开 → 最小化右下角 → 左下角展开 → 切换菜单 iframe 仍在。
+浮动打开 → 最小化可拖动浮动条 → 左下角展开 → 不可关闭仅可重启 → 切换菜单 iframe 仍在。
diff --git a/docs/changelog/2026-06-11-global-floating-browser.md b/docs/changelog/2026-06-11-global-floating-browser.md
index 8bd02d73..cde49ff8 100644
--- a/docs/changelog/2026-06-11-global-floating-browser.md
+++ b/docs/changelog/2026-06-11-global-floating-browser.md
@@ -34,7 +34,13 @@ pytest tests/test_browser_ui_state.py -q
 cd frontend && npm run type-check
 ```
 
-左下角地球按钮打开；最小化后在右下角；历史按钮可见记录；换账号后记录隔离。
+左下角地球按钮打开；最小化后为可拖动浮动条（默认右下角）；历史按钮可见记录；换账号后记录隔离。
+
+## 2026-06-11 更新 — 不可关闭、最小化可拖拽
+
+- 移除「关闭浏览器」按钮；仅 **最小化** 或 **重启**（重启保留浏览历史）
+- 最小化后为全局 **可拖动浮动条**（双击展开），位置持久化 `minimized_rect`
+- 仅剩一个标签时不可关闭该标签
 
 ## 说明
 
diff --git a/frontend/src/components/GlobalBrowserPanel.vue b/frontend/src/components/GlobalBrowserPanel.vue
index fefeefb9..43c32d35 100644
--- a/frontend/src/components/GlobalBrowserPanel.vue
+++ b/frontend/src/components/GlobalBrowserPanel.vue
@@ -27,6 +27,7 @@
             <v-tab v-for="tab in tabs" :key="tab.id" :value="tab.id" class="text-none px-2">
               <span class="text-truncate" style="max-width: 120px">{{ tabLabel(tab) }}</span>
               <v-btn
+                v-if="tabs.length > 1"
                 icon="mdi-close"
                 size="x-small"
                 variant="text"
@@ -59,6 +60,16 @@
             @click="showHistory = !showHistory"
           />
 
+          <v-btn
+            size="small"
+            variant="text"
+            icon="mdi-restart"
+            title="重启浏览器（保留历史记录）"
+            density="compact"
+            @mousedown.stop
+            @click="onRestart"
+          />
+
           <v-btn
             size="small"
             variant="text"
@@ -71,20 +82,11 @@
             size="small"
             variant="text"
             icon="mdi-window-minimize"
-            title="最小化到右下角"
-            density="compact"
-            @mousedown.stop
-            @click="minimizePanel"
-          />
-          <v-btn
-            size="small"
-            variant="text"
-            icon="mdi-close"
-            title="关闭浏览器"
+            title="最小化（可拖动）"
             density="compact"
             class="mr-1"
             @mousedown.stop
-            @click="closePanel"
+            @click="minimizePanel"
           />
         </div>
 
@@ -147,7 +149,7 @@
               <v-icon icon="mdi-web" size="48" class="mb-3 opacity-50" />
               <p class="text-body-2 text-center">输入地址后按回车或点「打开」</p>
               <p class="text-caption mt-2 text-center">
-                页面在您当前的 Chrome / Firefox 等浏览器引擎中渲染；切换侧栏菜单时浏览器保持活动。
+                浏览器不可关闭，仅可最小化或重启；页面在您当前的 Chrome / Firefox 引擎中渲染。
               </p>
             </div>
             <template v-else>
@@ -175,21 +177,43 @@
       </v-card>
     </div>
 
-    <v-card
+    <!-- Minimized — draggable floating bar (any corner) -->
+    <div
       v-if="minimized && tabs.length"
-      border
-      rounded="lg"
-      class="global-browser-dock-br"
+      class="global-browser-mini-float"
+      :style="miniPanelStyle"
     >
-      <v-icon icon="mdi-web" size="18" class="mr-2" />
-      <span class="text-caption text-truncate global-browser-dock-label" @click="openPanel">
-        {{ activeTab ? tabLabel(activeTab) : '浏览器' }}
-      </span>
-      <v-chip v-if="tabs.length > 1" size="x-small" class="ml-2">{{ tabs.length }}</v-chip>
-      <v-spacer />
-      <v-btn size="x-small" variant="text" icon="mdi-dock-window" title="展开" @click="openPanel" />
-      <v-btn size="x-small" variant="text" icon="mdi-close" title="关闭" @click="closePanel" />
-    </v-card>
+      <v-card border rounded="lg" class="global-browser-mini-panel h-100 d-flex flex-column">
+        <div
+          class="global-browser-mini-toolbar d-flex align-center px-2 flex-grow-1 global-browser-toolbar--draggable"
+          @mousedown="onMiniToolbarMouseDown"
+          @dblclick="openPanel"
+        >
+          <v-icon size="16" class="mr-1 text-disabled flex-shrink-0" @mousedown.stop>mdi-drag</v-icon>
+          <v-icon icon="mdi-web" size="18" class="mr-2 flex-shrink-0" />
+          <span class="text-caption text-truncate flex-grow-1 min-w-0" @click="openPanel">
+            {{ activeTab ? tabLabel(activeTab) : '浏览器' }}
+          </span>
+          <v-chip v-if="tabs.length > 1" size="x-small" class="mx-1 flex-shrink-0">{{ tabs.length }}</v-chip>
+          <v-btn
+            size="x-small"
+            variant="text"
+            icon="mdi-restart"
+            title="重启浏览器"
+            @mousedown.stop
+            @click.stop="onRestart"
+          />
+          <v-btn
+            size="x-small"
+            variant="text"
+            icon="mdi-dock-window"
+            title="展开"
+            @mousedown.stop
+            @click.stop="openPanel"
+          />
+        </div>
+      </v-card>
+    </div>
 
     <v-btn
       v-if="showLauncher"
@@ -198,10 +222,22 @@
       icon="mdi-web"
       size="large"
       elevation="4"
-      title="打开 / 展开浏览器"
+      title="展开浏览器"
       @click="onLauncherClick"
     />
   </Teleport>
+
+  <v-dialog v-model="showRestartConfirm" max-width="400">
+    <v-card border>
+      <v-card-title>重启浏览器？</v-card-title>
+      <v-card-text>将关闭所有标签并打开空白页，浏览历史记录会保留。</v-card-text>
+      <v-card-actions>
+        <v-spacer />
+        <v-btn variant="text" @click="showRestartConfirm = false">取消</v-btn>
+        <v-btn color="primary" variant="flat" @click="confirmRestart">重启</v-btn>
+      </v-card-actions>
+    </v-card>
+  </v-dialog>
 </template>
 
 <script setup lang="ts">
@@ -212,6 +248,7 @@ import { useGlobalBrowser } from '@/composables/useGlobalBrowser'
 defineProps<{ showLauncher: boolean }>()
 
 const showHistory = ref(false)
+const showRestartConfirm = ref(false)
 const maximized = ref(false)
 
 const {
@@ -224,12 +261,13 @@ const {
   activeTabId,
   activeTab,
   panelRect,
+  minimizedRect,
   canGoBack,
   canGoForward,
   tabLabel,
   openPanel,
   minimizePanel,
-  closePanel,
+  restartBrowser,
   navigate,
   refreshActive,
   goBack,
@@ -240,21 +278,45 @@ const {
   newEmptyTab,
   openFromHistory,
   savePanelRect,
+  saveMinimizedRect,
   bootstrap,
 } = useGlobalBrowser()
 
-const fallback: FloatRect = { x: 80, y: 72, w: 980, h: 640 }
+function defaultMiniRect(): FloatRect {
+  const w = 320
+  const h = 52
+  return {
+    x: Math.max(16, window.innerWidth - w - 16),
+    y: Math.max(16, window.innerHeight - h - 16),
+    w,
+    h,
+  }
+}
+
+const panelFallback: FloatRect = { x: 80, y: 72, w: 980, h: 640 }
 const { rect, panelStyle, startDrag, startResize, centerOnScreen } = useFloatingPanel(
   'nexus_global_browser_rect_v1',
-  fallback,
+  panelFallback,
 )
 
+const {
+  rect: miniRect,
+  panelStyle: miniPanelStyle,
+  startDrag: startMiniDrag,
+  clampToViewport: clampMiniViewport,
+} = useFloatingPanel('nexus_global_browser_mini_rect_v1', defaultMiniRect())
+
 function seedRectFromServer() {
   if (panelRect.value) {
     rect.value = { ...panelRect.value }
-    return
+  } else {
+    centerOnScreen()
+  }
+  if (minimizedRect.value) {
+    miniRect.value = { ...minimizedRect.value }
+  } else {
+    miniRect.value = defaultMiniRect()
   }
-  centerOnScreen()
 }
 
 onMounted(async () => {
@@ -266,11 +328,21 @@ watch(rect, (value) => {
   savePanelRect({ ...value })
 }, { deep: true })
 
+watch(miniRect, (value) => {
+  saveMinimizedRect({ ...value })
+}, { deep: true })
+
 function onToolbarMouseDown(e: MouseEvent) {
   if (maximized.value) return
   startDrag(e)
 }
 
+function onMiniToolbarMouseDown(e: MouseEvent) {
+  if (e.button !== 0) return
+  startMiniDrag(e)
+  clampMiniViewport()
+}
+
 function onResizeStart(e: MouseEvent) {
   startResize(e)
 }
@@ -290,10 +362,20 @@ function onLauncherClick() {
   }
   newEmptyTab()
 }
+
+function onRestart() {
+  showRestartConfirm.value = true
+}
+
+function confirmRestart() {
+  showRestartConfirm.value = false
+  restartBrowser()
+}
 </script>
 
 <style scoped>
-.global-browser-float {
+.global-browser-float,
+.global-browser-mini-float {
   position: fixed;
   z-index: 2350;
   display: flex;
@@ -307,19 +389,27 @@ function onLauncherClick() {
   left: 0 !important;
   top: 0 !important;
 }
-.global-browser-panel {
+.global-browser-panel,
+.global-browser-mini-panel {
   overflow: hidden;
   position: relative;
   height: 100%;
   background: rgb(var(--v-theme-surface));
 }
-.global-browser-toolbar {
+.global-browser-toolbar,
+.global-browser-mini-toolbar {
   height: 40px;
   min-height: 40px;
   border-bottom: 1px solid rgba(var(--v-border-color), var(--v-border-opacity));
 }
+.global-browser-mini-toolbar {
+  height: 100%;
+  min-height: 0;
+  border-bottom: none;
+}
 .global-browser-toolbar--draggable {
   cursor: move;
+  user-select: none;
 }
 .global-browser-nav {
   background: rgb(var(--v-theme-surface));
@@ -363,22 +453,6 @@ function onLauncherClick() {
     rgba(var(--v-theme-on-surface), 0.25) 50%
   );
 }
-.global-browser-dock-br {
-  position: fixed;
-  right: 16px;
-  bottom: 16px;
-  z-index: 2340;
-  max-width: min(420px, calc(100vw - 120px));
-  padding: 8px 12px;
-  display: flex;
-  align-items: center;
-  gap: 4px;
-  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
-}
-.global-browser-dock-label {
-  max-width: 200px;
-  cursor: pointer;
-}
 .global-browser-launcher {
   position: fixed;
   left: 16px;
diff --git a/frontend/src/composables/useGlobalBrowser.ts b/frontend/src/composables/useGlobalBrowser.ts
index 3ad6ede0..a9f05c7e 100644
--- a/frontend/src/composables/useGlobalBrowser.ts
+++ b/frontend/src/composables/useGlobalBrowser.ts
@@ -38,6 +38,7 @@ export interface BrowserStateResponse {
   active_tab_id: string | null
   minimized: boolean
   rect: FloatRect | null
+  minimized_rect: FloatRect | null
 }
 
 const bootstrapped = ref(false)
@@ -52,6 +53,7 @@ const visits = ref<BrowserVisit[]>([])
 const tabs = ref<BrowserTab[]>([])
 const activeTabId = ref<string | null>(null)
 const panelRect = ref<FloatRect | null>(null)
+const minimizedRect = ref<FloatRect | null>(null)
 
 let saveTimer: ReturnType<typeof setTimeout> | null = null
 
@@ -98,6 +100,7 @@ function applyServerState(data: BrowserStateResponse) {
   }
   minimized.value = Boolean(data.minimized)
   panelRect.value = data.rect
+  minimizedRect.value = data.minimized_rect
   panelOpen.value = tabs.value.length > 0 && !minimized.value
   syncAddressFromActive()
 }
@@ -136,6 +139,7 @@ async function persistState(extra?: { recordUrl?: string; recordTitle?: string }
       active_tab_id: activeTabId.value,
       minimized: minimized.value,
       rect: panelRect.value,
+      minimized_rect: minimizedRect.value,
     }
     if (extra?.recordUrl) {
       body.record_url = extra.recordUrl
@@ -200,13 +204,21 @@ function minimizePanel() {
   scheduleSave()
 }
 
-function closePanel() {
-  tabs.value = []
-  activeTabId.value = null
-  panelOpen.value = false
-  minimized.value = false
-  maximized.value = false
+/** Reset to a single blank tab; browsing history is kept. */
+function restartBrowser() {
+  const tab: BrowserTab = {
+    id: newTabId(),
+    url: '',
+    title: '新标签',
+    stack: [],
+    stackIndex: -1,
+    frameKey: 0,
+  }
+  tabs.value = [tab]
+  activeTabId.value = tab.id
   addressDraft.value = ''
+  lastError.value = null
+  openPanel()
   scheduleSave()
 }
 
@@ -289,6 +301,7 @@ function switchTab(id: string) {
 }
 
 function closeTab(id: string) {
+  if (tabs.value.length <= 1) return
   const idx = tabs.value.findIndex((t) => t.id === id)
   if (idx < 0) return
   const next = tabs.value.filter((t) => t.id !== id)
@@ -296,10 +309,6 @@ function closeTab(id: string) {
   if (activeTabId.value === id) {
     activeTabId.value = next[idx]?.id ?? next[idx - 1]?.id ?? null
   }
-  if (!next.length) {
-    closePanel()
-    return
-  }
   syncAddressFromActive()
   scheduleSave()
 }
@@ -329,6 +338,11 @@ function savePanelRect(rect: FloatRect) {
   scheduleSave()
 }
 
+function saveMinimizedRect(rect: FloatRect) {
+  minimizedRect.value = rect
+  scheduleSave()
+}
+
 export function useGlobalBrowser() {
   return {
     bootstrapped,
@@ -344,6 +358,7 @@ export function useGlobalBrowser() {
     activeTabId,
     activeTab,
     panelRect,
+    minimizedRect,
     isActive,
     canGoBack,
     canGoForward,
@@ -351,7 +366,7 @@ export function useGlobalBrowser() {
     bootstrap,
     openPanel,
     minimizePanel,
-    closePanel,
+    restartBrowser,
     openUrl,
     navigate,
     refreshActive,
@@ -363,6 +378,7 @@ export function useGlobalBrowser() {
     newEmptyTab,
     openFromHistory,
     savePanelRect,
+    saveMinimizedRect,
     scheduleSave,
   }
 }
diff --git a/server/api/browser.py b/server/api/browser.py
index c2e9db19..1e8984e9 100644
--- a/server/api/browser.py
+++ b/server/api/browser.py
@@ -47,6 +47,7 @@ class BrowserStateUpdate(BaseModel):
     active_tab_id: str | None = None
     minimized: bool | None = None
     rect: BrowserPanelRect | None = None
+    minimized_rect: BrowserPanelRect | None = None
     record_url: str | None = Field(default=None, description="Append one visit + history entry")
     record_title: str | None = None
 
@@ -75,6 +76,8 @@ async def put_browser_state(
         incoming["tabs"] = [t.model_dump(exclude_none=True) for t in payload.tabs]
     if payload.rect is not None:
         incoming["rect"] = payload.rect.model_dump()
+    if payload.minimized_rect is not None:
+        incoming["minimized_rect"] = payload.minimized_rect.model_dump()
 
     merged = merge_browser_state(current, incoming)
     if payload.record_url:
diff --git a/server/utils/browser_ui_state.py b/server/utils/browser_ui_state.py
index 8e565473..06ab8c63 100644
--- a/server/utils/browser_ui_state.py
+++ b/server/utils/browser_ui_state.py
@@ -43,9 +43,24 @@ def empty_browser_state() -> dict[str, Any]:
         "active_tab_id": None,
         "minimized": False,
         "rect": None,
+        "minimized_rect": None,
     }
 
 
+def _parse_rect(raw: dict | None, *, default_w: float, default_h: float) -> dict[str, float] | None:
+    if raw is None or not isinstance(raw, dict):
+        return None
+    try:
+        return {
+            "x": float(raw.get("x", 0)),
+            "y": float(raw.get("y", 0)),
+            "w": float(raw.get("w", default_w)),
+            "h": float(raw.get("h", default_h)),
+        }
+    except (TypeError, ValueError):
+        return None
+
+
 def parse_browser_state(raw: dict | None) -> dict[str, Any]:
     base = empty_browser_state()
     if not raw or not isinstance(raw, dict):
@@ -78,20 +93,26 @@ def parse_browser_state(raw: dict | None) -> dict[str, Any]:
         url = item.get("url")
         if not isinstance(tab_id, str) or not tab_id.strip():
             continue
-        if not isinstance(url, str) or not _is_safe_url(url):
+        if not isinstance(url, str):
             continue
-        stack = [
-            u for u in item.get("stack") or [url]
-            if isinstance(u, str) and _is_safe_url(u)
-        ] or [url]
-        stack_index = item.get("stack_index", len(stack) - 1)
-        if not isinstance(stack_index, int):
-            stack_index = len(stack) - 1
-        stack_index = max(0, min(stack_index, len(stack) - 1))
+        if url.strip() and not _is_safe_url(url):
+            continue
+        if url.strip():
+            stack = [
+                u for u in item.get("stack") or [url]
+                if isinstance(u, str) and _is_safe_url(u)
+            ] or [url]
+            stack_index = item.get("stack_index", len(stack) - 1)
+            if not isinstance(stack_index, int):
+                stack_index = len(stack) - 1
+            stack_index = max(0, min(stack_index, len(stack) - 1))
+        else:
+            stack = []
+            stack_index = -1
         tabs.append({
             "id": tab_id.strip()[:64],
-            "url": url,
-            "title": str(item.get("title") or _hostname(url))[:200],
+            "url": url.strip(),
+            "title": str(item.get("title") or (_hostname(url) if url.strip() else "新标签"))[:200],
             "stack": stack[-64:],
             "stack_index": stack_index,
         })
@@ -101,19 +122,8 @@ def parse_browser_state(raw: dict | None) -> dict[str, Any]:
     if not isinstance(active_tab_id, str) or not any(t["id"] == active_tab_id for t in tabs):
         active_tab_id = tabs[0]["id"] if tabs else None
 
-    rect = raw.get("rect")
-    if rect is not None and not isinstance(rect, dict):
-        rect = None
-    if isinstance(rect, dict):
-        try:
-            rect = {
-                "x": float(rect.get("x", 0)),
-                "y": float(rect.get("y", 0)),
-                "w": float(rect.get("w", 960)),
-                "h": float(rect.get("h", 640)),
-            }
-        except (TypeError, ValueError):
-            rect = None
+    rect = _parse_rect(raw.get("rect"), default_w=960, default_h=640)
+    minimized_rect = _parse_rect(raw.get("minimized_rect"), default_w=320, default_h=52)
 
     minimized = bool(raw.get("minimized"))
 
@@ -124,6 +134,7 @@ def parse_browser_state(raw: dict | None) -> dict[str, Any]:
         "active_tab_id": active_tab_id,
         "minimized": minimized,
         "rect": rect,
+        "minimized_rect": minimized_rect,
     }