fix: open browser popup links in managed tabs

Links requesting a new window were silently blocked. Open them in managed browser tabs with the existing session restrictions, clean up script-closed tabs, and follow click-created tabs in subsequent direct and MCP browser tools.

Validation: 232 targeted tests and Windows Electron E2E passed; typecheck and lint passed. The full suite retains six failures outside the popup path.

Release note: Browser links that open a new page now open in a managed tab, and AI browser actions follow the new page after a click.

docs/features/assistant-workbar/browser-tabs-technical-design.md

@@ -153,9 +153,38 @@ Conversation 归属，不新建租约或把页面重新归属到子级对话。
 单次工具取消信号、Tab 使用租约信号和请求信号，取消一次工具调用不终止后续调用。
 
 该阶段 MCP transport、endpoint 和 token 生命周期不变，只扩展服务端 capability 内容和内部
-路由。工具调用使用当前请求绑定的 Tab，只有上述显式导航恢复会更换绑定。
+路由。工具调用使用当前请求绑定的 Tab；显式导航恢复和下述点击开窗会更换绑定。
 
-### 6.2 Agent 多 Tab 阶段
+### 6.2 Page-created tabs
+
+`target="_blank"` and `window.open` create managed `WebContentsView` tabs through Electron's
+`setWindowOpenHandler.createWindow`. Chromium retains the original request and opener relationship,
+including a blank window followed by a script-assigned location. These tabs share the Conversation
+partition, proxy and permission restrictions. HTTP(S) URL checks remain in the session and filtering
+proxy; `about:blank` is permitted only as the initial empty popup. Unsupported URL schemes remain denied.
+
+BrowserService reserves capacity before creating the native view, assigns a new Tab/workbar identity,
+and owns initialization, the Driver and cleanup. Initialization failure or Conversation disposal releases
+the popup. Closing the opener leaves an already created popup alive. A popup's `window.close()` releases
+its service slot and usage leases; Renderer removes its workbar instance and returns to the opener when
+it is still available. No separate unmanaged BrowserWindow is created.
+
+Live state includes `openerTabId`. A popup from the visible browser is selected even when the active chat
+has switched to a different Conversation. Other workbar panels and viewport occlusion rules retain their
+existing behavior. The existing workbar capacity notification still applies when all 32 slots are occupied.
+
+During `browser_click`, the service collects popup registrations from that Tab and waits for their
+initialization. The result identifies the last created popup. BrowserModelTools binds subsequent tools to
+that Tab and asks the model to obtain new references with `browser_snapshot`; the MCP gateway also replaces
+its capability binding and usage lease. Switching visible tabs does not alter this binding. Closing the
+popup retains the existing explicit `browser_navigate` recovery behavior. A page may still be loading
+when the click returns. Popups requested asynchronously after the click has completed are displayed as
+managed tabs, but are not attributed to that completed tool call.
+
+The remote ACP Runtime exposes its separately scoped image MCP server, not this desktop browser gateway;
+this change does not add browser access to the deployed GoodBuddy Agent.
+
+### 6.3 Agent 多 Tab 阶段
 
 只有明确需要 Agent 管理多个页面时，才增加：
 

docs/features/assistant-workbar/prd.md

@@ -230,7 +230,7 @@ Runtime
 从当前聊天右栏迁移时，Task Center 和工作区作为默认打开、单实例且不可关闭的基础应用保留；
 浏览器保留一个默认打开实例，但注册为可关闭的多实例应用；成果保持默认打开、单实例且可
 关闭；终端不默认打开，由用户通过“+”创建，并从首期开始支持多实例。Tab 必须单行横向滚动，
-不能自动隐藏或缩写到不可辨认，“+”不能随滚动消失。Task Center 继续作为 Task 的现有
+不能自动隐藏或缩写到不可辨认，“+”紧随最后一个 Tab 并随标签滚动，溢出时两端提供固定滚动箭头。Task Center 继续作为 Task 的现有
 入口；审批定位到所属 Task 或 Runtime。智能心跳不作为工作栏页签，其报告、建议、历史和
 完整配置统一归属“智能心跳”菜单入口。当前阶段不新增独立自动化中心。
 
@@ -457,6 +457,12 @@ Renderer 不接收任意系统 PID 控制能力。控制动作引用 Main 签发
 
 ### 7.7 浏览器
 
+Page requests made with `target="_blank"` or `window.open` open managed browser tabs in the same
+Conversation. A popup from the visible page becomes visible in the workbar; closing it from page script
+removes that popup tab. When an Agent click opens a new tab, subsequent browser tools follow that page
+and obtain fresh element references. Detailed lifecycle and routing rules are defined in
+[Page-created tabs](./browser-tabs-technical-design.md#62-page-created-tabs).
+
 浏览器是可关闭的多实例应用。升级后的默认布局保留一个浏览器实例；用户从“+”目录选择
 浏览器时每次创建新的 Browser Tab。每个实例必须显示可区分的标题和绑定 Conversation，
 不能让多个工作栏 Tab 只是同一页面的重复控制入口。

docs/features/assistant-workbar/progress.md

@@ -1,5 +1,32 @@
 # 工作栏实现与验证进度
 
+## 2026-09-15 Managed browser popups
+
+Implemented [page-created tabs](./browser-tabs-technical-design.md#62-page-created-tabs): native
+Electron popup creation now registers a managed Tab, and click results update direct-tool and MCP
+bindings. Renderer selects a visible opener's popup across chat switches and removes script-closed
+popup instances. Existing worktree changes were retained.
+
+Validation against the current source:
+
+- `npx vitest run src/main/browser src/main/agent/knowledge-mcp-gateway.test.ts src/main/agent/model-tool-provider.test.ts src/renderer/src/RightAssistantSidebar.resize.test.tsx src/shared/contracts.test.ts`: 10 files, 232 tests passed.
+- `node build/run-browser-tabs-electron-e2e.cjs`: passed twice after making the test wait for the shown
+  native view's animation frames before sending mouse input. Real Chromium verified `target=_blank`,
+  `window.open(url)`, blank-then-location, script close, opener close, shared partition, unsupported URL
+  denial, and subsequent direct/MCP snapshots on the popup. No fixed click delay was added to production.
+- `npm run typecheck` and `npm run lint`: passed. `git diff --check`: no whitespace errors.
+- `npm test`: 4319 passed, 67 skipped, 6 failed across 5 files. Failures were Agent offline dependency
+  installation timeout, local Runtime reuse timeout, diagnostic-log writer expectations, two heartbeat
+  migration fixtures with `duplicate column name: pinned`, and an App external knowledge binding test
+  missing the `Remote handbook` heading. The full suite was not green; none of these failures exercise
+  the popup registration or binding path.
+
+The Electron test uses production BrowserService, CDP and MCP with a local HTTP fixture; the workbar
+selection/removal path is covered by the actual Renderer component test. A complete installed-App
+visual test and macOS/Linux native popup checks were not run. No external model calls were made for
+the popup validation. Remote ACP exposes only its scoped image MCP server (`imageMcpServers`), so the
+deployed Agent has no separate affected browser implementation and no remote Host change was needed.
+
 ## 2026-09-15 会话置顶与浮动操作菜单
 
 已核对当前源码差异：置顶经专用 IPC 写入 SQLite，schema 36 迁移保留已有会话；会话操作

src/main/agent/knowledge-mcp-gateway.ts

@@ -1712,6 +1712,15 @@ export class KnowledgeMcpGateway {
                 browserSignal
               )
               browserSignal.throwIfAborted()
+              const openedTabId = browserTools.getBoundTabId()
+              if (openedTabId !== lease.tabId && capability.browserUsageLease === lease) {
+                const replacement = this.browserService!.acquireTabUsage(
+                  capability.browserConversationId!, openedTabId, capability.requestId
+                )
+                capability.browserTabId = openedTabId
+                capability.browserUsageLease = replacement
+                lease.release()
+              }
               return {
                 content: result.parts.map((part) =>
                   part.type === 'text'

src/main/browser/browser-model-tools.test.ts

@@ -48,6 +48,24 @@ const browserTabId = browserTabIdSchema.parse(
 )
 
 describe('BrowserModelTools', () => {
+  it('binds subsequent tools and approval origin to the popup returned by a click', async () => {
+    const service = createService()
+    const popupId = browserTabIdSchema.parse(crypto.randomUUID())
+    vi.mocked(service.click).mockResolvedValue({
+      conversationId: 'conversation', tabId: popupId, workbarInstanceId: popupId,
+      primary: false, status: 'ready', isLoading: false, canGoBack: false,
+      url: 'https://popup.example/', createdAt: 1, updatedAt: 1
+    })
+    const tools = new BrowserModelTools({ service, conversationId: 'conversation', browserTabId })
+    const result = await tools.callTool('browser_click', { ref }, signal)
+    expect(JSON.stringify(result)).toContain(popupId)
+    expect(JSON.stringify(result)).toContain('browser_snapshot')
+    expect(tools.getBoundTabId()).toBe(popupId)
+    await tools.callTool('browser_snapshot', {}, signal)
+    expect(service.snapshot).toHaveBeenLastCalledWith('conversation', signal, popupId)
+    tools.getApproval('browser_snapshot', {})
+    expect(service.getOrigin).toHaveBeenLastCalledWith('conversation', popupId)
+  })
   it('publishes seven strict, bounded builtin tool definitions', () => {
     const tools = new BrowserModelTools({
       service: createService(),

src/main/browser/browser-model-tools.ts

@@ -373,6 +373,10 @@ export class BrowserModelTools {
     }
   }
 
+  getBoundTabId(): BrowserTabId {
+    return this.browserTabId
+  }
+
   private async callBoundTool(
     name: BrowserToolName,
     argumentsValue: Record<string, unknown>,
@@ -403,12 +407,21 @@ export class BrowserModelTools {
     }
     if (name === 'browser_click') {
       const input = browserClickInputSchema.parse(argumentsValue)
-      await this.service.click(
+      const opened = await this.service.click(
         this.conversationId,
         input.ref,
         signal,
         browserTabId
       )
+      if (opened) {
+        this.browserTabId = opened.tabId
+        return createTextResult({
+          clicked: input.ref,
+          openedTabId: opened.tabId,
+          url: opened.url ?? 'about:blank',
+          message: '已切换到新标签页。请调用 browser_snapshot 获取新页面引用；旧页面引用不可复用。'
+        })
+      }
       return createTextResult({ clicked: input.ref })
     }
     if (name === 'browser_type') {

src/main/browser/browser-service.test.ts

@@ -1,4 +1,5 @@
 import { afterEach, describe, expect, it, vi } from 'vitest'
+import { EventEmitter } from 'node:events'
 import { BrowserUrlPolicy, canonicalizeBrowserUrl } from './browser-url-policy'
 import {
   BrowserNavigationStoppedError,
@@ -15,6 +16,8 @@ type HarnessSlot = {
   approvedOrigin?: string
   emitLoading(isLoading: boolean): void
   emitNavigation(url: string): void
+  openPopup(session: BrowserSessionLike, ready?: Promise<void>): boolean
+  destroy(): void
   session: BrowserSessionLike
   driver: BrowserDriverLike
 }
@@ -54,14 +57,22 @@ function createHarness(options: {
   const createSession = vi.fn(async (): Promise<BrowserSessionLike> => {
     await options.sessionGate
     const slot = {} as HarnessSlot
+    const events = new EventEmitter()
+    let destroyed = false
     const webContents = {
+      on: events.on.bind(events),
+      off: events.off.bind(events),
+      isDestroyed: () => destroyed,
       getURL: () => slot.currentUrl ?? `${slot.currentOrigin}/page`
     } as BrowserWebContents
     const loadingListeners = new Set<(isLoading: boolean) => void>()
     const navigationListeners = new Set<(url: string) => void>()
     let isLoading = false
+    let popupHandler: Parameters<NonNullable<BrowserSessionLike['setPopupHandler']>>[0]
+    let canOpenPopup: () => boolean
     const session: BrowserSessionLike = {
       webContents,
+      setPopupHandler: (handler, canOpen) => { popupHandler = handler; canOpenPopup = canOpen },
       approveNavigation: vi.fn((target) => {
         slot.approvedOrigin = target.origin
       }),
@@ -126,6 +137,12 @@ function createHarness(options: {
     Object.assign(slot, {
       session,
       driver,
+      openPopup: (popup: BrowserSessionLike, ready = Promise.resolve()) => {
+        if (!canOpenPopup()) return false
+        popupHandler(() => ({ session: popup, ready }))
+        return true
+      },
+      destroy: () => { destroyed = true; events.emit('destroyed') },
       emitLoading: (loading: boolean) => {
         isLoading = loading
         for (const listener of loadingListeners) {
@@ -168,6 +185,56 @@ afterEach(() => {
 })
 
 describe('BrowserService', () => {
+  it('adopts click popups with ownership and releases script-closed tabs without closing the opener', async () => {
+    const harness = createHarness()
+    const signal = new AbortController().signal
+    const states: BrowserLiveState[] = []
+    harness.service.onState((state) => states.push(state))
+    try {
+      await harness.service.navigate('conversation', 'https://example.com/', signal, undefined, 21)
+      const opener = harness.slots[0]!
+      const openerTab = harness.service.listTabs('conversation')[0]!
+      const popupSession = await harness.createSession()
+      const popup = harness.slots[1]!
+      popup.currentUrl = 'https://popup.example/'
+      popup.currentOrigin = 'https://popup.example'
+      const ready = deferred<void>()
+      vi.mocked(opener.driver.click).mockImplementation(async () => {
+        expect(opener.openPopup(popupSession, ready.promise)).toBe(true)
+      })
+      const click = harness.service.click('conversation', 'b_link', signal, openerTab.tabId)
+      await vi.waitFor(() => expect(harness.service.getTabCount()).toBe(2))
+      ready.resolve()
+      const opened = await click
+      expect(opened).toMatchObject({ url: 'https://popup.example/', workbarInstanceId: expect.any(String) })
+      expect(states.find((state) => state.tabId === opened!.tabId)).toMatchObject({ openerTabId: openerTab.tabId, ownerWindowId: 21 })
+      await harness.service.snapshot('conversation', signal, opened!.tabId)
+      popup.destroy()
+      await vi.waitFor(() => expect(popupSession.dispose).toHaveBeenCalledOnce())
+      expect(harness.service.listTabs('conversation').map((tab) => tab.tabId)).toEqual([openerTab.tabId])
+      expect(opener.session.dispose).not.toHaveBeenCalled()
+      await vi.waitFor(() => expect(states.at(-1)).toMatchObject({ status: 'stopped', openerTabId: openerTab.tabId }))
+    } finally { await harness.service.dispose() }
+  })
+
+  it('counts pending popups against capacity and cleans up initialization after conversation close', async () => {
+    const harness = createHarness({ maximumTabsPerConversation: 2 })
+    const signal = new AbortController().signal
+    try {
+      await harness.service.navigate('conversation', 'https://example.com/', signal)
+      const opener = harness.slots[0]!
+      const popupSession = await harness.createSession()
+      harness.slots[1]!.currentUrl = 'about:blank'
+      const ready = deferred<void>()
+      expect(opener.openPopup(popupSession, ready.promise)).toBe(true)
+      expect(opener.openPopup(popupSession)).toBe(false)
+      await harness.service.releaseConversation('conversation')
+      ready.resolve()
+      await vi.waitFor(() => expect(popupSession.dispose).toHaveBeenCalledOnce())
+      expect(harness.service.getTabCount()).toBe(0)
+      expect(opener.openPopup(popupSession)).toBe(false)
+    } finally { await harness.service.dispose() }
+  })
   const firstLeaseToken = '7d201980-0ad4-4670-81d4-dc2bf79f03b2'
   const secondLeaseToken = 'db8a2c28-43a6-4aab-93e0-1c01b9374dca'
   const workbarInstanceId = '0387bd61-3a12-40ce-98d7-ef5d14cc8251'

src/main/browser/browser-service.ts

@@ -45,6 +45,10 @@ export type BrowserSessionLike = {
     target: Awaited<ReturnType<BrowserUrlPolicy['validate']>>
   ): void
   createTab?(signal: AbortSignal): Promise<BrowserSessionLike>
+  setPopupHandler?(
+    handler: (create: () => { session: BrowserSessionLike; ready: Promise<void> }) => void,
+    canOpen: () => boolean
+  ): void
   getCurrentOrigin(): string | undefined
   isLoading(): boolean
   onLoadingChange(listener: (isLoading: boolean) => void): () => void
@@ -108,6 +112,9 @@ type BrowserTabSlot = {
   stopLoadingRequested: boolean
   removeLoadingListener: () => void
   removeNavigationListener: () => void
+  removeCloseListener: () => void
+  popupOperations?: Promise<BrowserTabSummary>[]
+  openerTabId?: BrowserTabId
   released: boolean
   workbarInstanceId?: string
   usageLeases: Map<symbol, {
@@ -360,6 +367,9 @@ export class BrowserService {
     const state: BrowserLiveState = {
       conversationId: tab.conversationId,
       tabId: tab.tabId,
+      ...((current?.openerTabId ?? previous?.openerTabId)
+        ? { openerTabId: current?.openerTabId ?? previous?.openerTabId }
+        : {}),
       ...((tab.workbarInstanceId ?? current?.workbarInstanceId ?? previous?.workbarInstanceId)
         ? { workbarInstanceId: tab.workbarInstanceId ?? current?.workbarInstanceId ?? previous?.workbarInstanceId }
         : {}),
@@ -496,10 +506,42 @@ export class BrowserService {
       stopLoadingRequested: false,
       removeLoadingListener: () => undefined,
       removeNavigationListener: () => undefined,
+      removeCloseListener: () => undefined,
       released: false,
       usageLeases: new Map(),
       ...(workbarInstanceId ? { workbarInstanceId } : {})
     }
+    session.setPopupHandler?.((create) => {
+      const context = this.conversations.get(conversationId)!
+      const releaseReservation = this.reserveTab(conversationId, context.ownerWindowId)
+      let popup: ReturnType<typeof create>
+      try {
+        popup = create()
+      } catch (error) {
+        releaseReservation()
+        throw error
+      }
+      const operation = this.adoptPopup(context, popup.session, popup.ready, tab.tabId).finally(releaseReservation)
+      tab.popupOperations?.push(operation)
+      void operation.catch((error: unknown) => {
+        if (this.hasTab(tab)) this.emitFailure(tab, '打开浏览器新标签页', error)
+      })
+    }, () => {
+      if (!this.hasTab(tab) || this.clearing || this.disposed) return false
+      try {
+        this.assertTabCapacity(this.conversations.get(conversationId), this.getOwnerWindowId(conversationId))
+        return true
+      } catch (error) {
+        this.emitFailure(tab, '打开浏览器新标签页', error)
+        return false
+      }
+    })
+    const closed = (): void => {
+      const context = this.conversations.get(conversationId)
+      if (context && this.hasTab(tab)) void this.releaseTab(context, tab).catch(() => undefined)
+    }
+    session.webContents.on?.('destroyed', closed)
+    tab.removeCloseListener = () => { session.webContents.off?.('destroyed', closed) }
     tab.removeLoadingListener = session.onLoadingChange((isLoading) => {
       if (!isLoading) tab.stopLoadingRequested = false
       if (tab.released || tab.isLoading === isLoading || !this.hasTab(tab)) return
@@ -536,6 +578,40 @@ export class BrowserService {
     return tab
   }
 
+  private async adoptPopup(
+    conversation: BrowserConversationSlot,
+    session: BrowserSessionLike,
+    ready: Promise<void>,
+    openerTabId: BrowserTabId
+  ): Promise<BrowserTabSummary> {
+    const tabId = createTabId()
+    let tab: BrowserTabSlot | undefined
+    void ready.catch(() => undefined)
+    try {
+      tab = await this.createTabSlot(conversation, conversation.conversationId, session, tabId, tabId)
+      tab.openerTabId = openerTabId
+      conversation.ownedTabs.set(tabId, tabId)
+      if (conversation.released || session.webContents.isDestroyed()) throw new Error('浏览器会话已关闭')
+      this.emitState(tab, 'ready')
+      this.applyViewport()
+      await waitFor(ready, AbortSignal.any([this.lifecycle.signal, conversation.lifecycle.signal]))
+      if (!this.hasTab(tab)) throw new Error('浏览器标签页已关闭')
+      const url = session.webContents.getURL()
+      if (url && url !== 'about:blank') {
+        const target = await this.policy.validateRedirect(url, conversation.lifecycle.signal)
+        session.approveNavigation(target)
+        tab.origin = target.origin
+        await this.refreshNavigationState(tab, conversation.lifecycle.signal)
+      }
+      this.touchConversation(conversation.conversationId)
+      return this.summarizeTab(tab)
+    } catch (error) {
+      if (tab) await this.releaseTab(conversation, tab).catch(() => undefined)
+      else await session.dispose().catch(() => undefined)
+      throw error
+    }
+  }
+
   private hasTab(tab: BrowserTabSlot): boolean {
     return !tab.released && this.conversations.get(tab.conversationId)?.tabs.get(tab.tabId) === tab
   }
@@ -641,6 +717,7 @@ export class BrowserService {
     if (signal.aborted || !hasWaiters() || this.releaseRequests.has(conversationId)) {
       tab.removeLoadingListener()
       tab.removeNavigationListener()
+      tab.removeCloseListener()
       tab.driver.dispose()
       await boundedCleanup(session.dispose(), this.cleanupTimeoutMs)
       throw signal.reason ?? new Error('浏览器会话创建已取消')
@@ -1087,11 +1164,19 @@ export class BrowserService {
     }, tabId, ownerWindowId)
   }
 
-  async click(conversationId: string, ref: string, signal: AbortSignal, tabId?: BrowserTabId, ownerWindowId?: number): Promise<void> {
-    await this.runInTab(conversationId, signal, 'acting', true, '浏览器点击', async (tab, effectiveSignal) => {
+  async click(conversationId: string, ref: string, signal: AbortSignal, tabId?: BrowserTabId, ownerWindowId?: number): Promise<BrowserTabSummary | void> {
+    return this.runInTab(conversationId, signal, 'acting', true, '浏览器点击', async (tab, effectiveSignal) => {
       await this.verifyCurrentOriginOrRelease(tab)
-      await tab.driver.click(ref, effectiveSignal)
-      await this.refreshNavigationState(tab, effectiveSignal)
+      const popups: Promise<BrowserTabSummary>[] = []
+      tab.popupOperations = popups
+      try {
+        await tab.driver.click(ref, effectiveSignal)
+        await this.refreshNavigationState(tab, effectiveSignal)
+        const opened = await waitFor(Promise.all(popups), effectiveSignal)
+        return opened.at(-1)
+      } finally {
+        tab.popupOperations = undefined
+      }
     }, tabId, ownerWindowId)
   }
 
@@ -1295,6 +1380,7 @@ export class BrowserService {
     conversation.tabs.delete(tab.tabId)
     tab.removeLoadingListener()
     tab.removeNavigationListener()
+    tab.removeCloseListener()
     tab.active?.controller.abort(new Error('浏览器会话已释放'))
     for (const lease of tab.usageLeases.values()) {
       lease.controller.abort(new Error('浏览器标签页使用租约已终止'))

src/main/browser/electron-browser-session.test.ts

@@ -25,7 +25,7 @@ function createHarness() {
   const partitionEvents = new EventEmitter()
   let currentUrl = ''
   let loadingMainFrame = false
-  let openHandler: ((details: { url: string }) => { action: 'deny' }) | undefined
+  let openHandler: Parameters<BrowserWebContents['setWindowOpenHandler']>[0] | undefined
   const sendCommand = vi.fn(async () => ({}))
   const capturedImage = {
     getSize: () => ({ width: 1_280, height: 800 }),
@@ -150,6 +150,48 @@ function createHarness() {
 }
 
 describe('ElectronBrowserSession', () => {
+  it('creates native popups in the sandboxed shared partition and rejects unsupported URLs', async () => {
+    const opener = createHarness()
+    const child = createHarness()
+    opener.window.createPopupView = vi.fn(() => child.window)
+    const session = await ElectronBrowserSession.create({
+      policy: opener.policy, createPartition: async () => opener.partition,
+      createView: async () => opener.window, createProxy: () => opener.proxy
+    })
+    let popup: ElectronBrowserSession | undefined
+    let ready: Promise<void> | undefined
+    session.setPopupHandler((create) => {
+      const created = create()
+      popup = created.session
+      ready = created.ready
+    }, () => true)
+    try {
+      for (const url of ['file:///secret', 'javascript:alert(1)', 'data:text/html,hello']) {
+        expect(opener.getOpenHandler()!({ url })).toEqual({ action: 'deny' })
+      }
+      const response = opener.getOpenHandler()!({ url: 'https://example.com/popup' })
+      expect(response).toMatchObject({ action: 'allow', outlivesOpener: true,
+        overrideBrowserWindowOptions: { webPreferences: {
+          partition: session.partition, sandbox: true, contextIsolation: true,
+          nodeIntegration: false, nodeIntegrationInSubFrames: false, nodeIntegrationInWorker: false
+        } }
+      })
+      expect(response.createWindow!(response.overrideBrowserWindowOptions!)).toBe(child.webContents)
+      expect(child.getOpenHandler()).toBeDefined()
+      const preventDefault = vi.fn()
+      child.contentEvents.emit('will-navigate', { preventDefault }, 'file:///secret')
+      expect(preventDefault).toHaveBeenCalledOnce()
+      await ready
+      expect(popup!.partition).toBe(session.partition)
+      await session.dispose()
+      expect(opener.partition.clearData).not.toHaveBeenCalled()
+      await popup!.dispose()
+      expect(opener.partition.clearData).toHaveBeenCalledOnce()
+    } finally {
+      await popup?.dispose()
+      await session.dispose()
+    }
+  })
   it('creates an isolated sandboxed partition and denies privileged capabilities', async () => {
     const harness = createHarness()
     const createView = vi.fn(async (options: Record<string, unknown>) => {

src/main/browser/electron-browser-session.ts

@@ -36,7 +36,12 @@ export type BrowserWebContents = {
   on(event: string, listener: BrowserEventListener): unknown
   off(event: string, listener: BrowserEventListener): unknown
   setWindowOpenHandler(
-    handler: (details: { url: string }) => { action: 'deny' }
+    handler: (details: { url: string }) => {
+      action: 'deny' | 'allow'
+      outlivesOpener?: boolean
+      overrideBrowserWindowOptions?: Record<string, unknown>
+      createWindow?: (options: Record<string, unknown>) => BrowserWebContents
+    }
   ): void
   capturePage?(): Promise<BrowserCapturedImage>
   loadURL?(url: string): Promise<unknown>
@@ -51,6 +56,7 @@ export type BrowserWebContents = {
 export type BrowserViewHandle = {
   webContents: BrowserWebContents
   nativeView?: unknown
+  createPopupView?: (options: Record<string, unknown>) => BrowserViewHandle
   setVisible(visible: boolean): void
   setBounds(bounds: BrowserWindowBounds): void
 }
@@ -245,13 +251,17 @@ async function defaultCreateView(
   options: Record<string, unknown>
 ): Promise<BrowserViewHandle> {
   const electron = await import('electron')
-  const view = new electron.WebContentsView(options)
-  view.setVisible(false)
-  return {
-    nativeView: view,
-    webContents: view.webContents as unknown as BrowserWebContents,
-    setVisible: (visible) => view.setVisible(visible),
-    setBounds: (bounds) => view.setBounds(bounds)
+  return createView(options)
+  function createView(options: Record<string, unknown>): BrowserViewHandle {
+    const view = new electron.WebContentsView(options)
+    view.setVisible(false)
+    return {
+      nativeView: view,
+      createPopupView: createView,
+      webContents: view.webContents as unknown as BrowserWebContents,
+      setVisible: (visible) => view.setVisible(visible),
+      setBounds: (bounds) => view.setBounds(bounds)
+    }
   }
 }
 
@@ -264,6 +274,16 @@ export class ElectronBrowserSession {
   private readonly navigationListeners = new Set<(url: string) => void>()
   private loading = false
   private disposed = false
+  private popupHandler?: (create: () => { session: ElectronBrowserSession; ready: Promise<void> }) => void
+  private canOpenPopup?: () => boolean
+
+  setPopupHandler(
+    handler: (create: () => { session: ElectronBrowserSession; ready: Promise<void> }) => void,
+    canOpen: () => boolean
+  ): void {
+    this.popupHandler = handler
+    this.canOpenPopup = canOpen
+  }
 
   private constructor(
     private readonly policy: BrowserUrlPolicy,
@@ -462,7 +482,41 @@ export class ElectronBrowserSession {
     this.listen(contents, 'did-stop-loading', () => {
       this.setLoading(contents.isLoadingMainFrame?.() ?? false)
     })
-    contents.setWindowOpenHandler(() => ({ action: 'deny' }))
+    contents.setWindowOpenHandler(({ url }) => {
+      if (this.disposed || !this.view.createPopupView || !this.popupHandler || !this.canOpenPopup?.()) {
+        return { action: 'deny' }
+      }
+      if (url !== 'about:blank') {
+        try { canonicalizeBrowserUrl(url) } catch { return { action: 'deny' } }
+      }
+      return {
+        action: 'allow',
+        outlivesOpener: true,
+        overrideBrowserWindowOptions: {
+          webPreferences: {
+            partition: this.partition, sandbox: true, contextIsolation: true,
+            nodeIntegration: false, nodeIntegrationInSubFrames: false,
+            nodeIntegrationInWorker: false, webSecurity: true,
+            allowRunningInsecureContent: false, plugins: false, devTools: false,
+            safeDialogs: true, backgroundThrottling: false
+          }
+        },
+        createWindow: (options) => {
+          let popup!: ElectronBrowserSession
+          this.popupHandler!(() => {
+            this.assertOpen()
+            const view = this.view.createPopupView!(options)
+            this.resources.references += 1
+            popup = new ElectronBrowserSession(this.policy, view, this.resources, this.parentWindow)
+            if (view.nativeView) this.parentWindow?.contentView?.addChildView(view.nativeView)
+            // Install navigation guards synchronously, before Chromium starts the popup request.
+            const ready = boundedSetup(popup.initialize(), new AbortController().signal, this.resources.setupTimeoutMs)
+            return { session: popup, ready }
+          })
+          return popup.webContents
+        }
+      }
+    })
     this.listen(contents, 'will-navigate', (event: { preventDefault(): void }, details: { url?: string } | string) => {
       const url = typeof details === 'string' ? details : details.url
       if (!url || !this.updateOriginFromUrl(url)) {
@@ -494,6 +548,7 @@ export class ElectronBrowserSession {
       callback()
     })
     this.listen(contents, 'did-navigate', (_event: unknown, url: string) => {
+      if (url === 'about:blank') return
       if (url && !this.updateOriginFromUrl(url)) {
         contents.stop()
         return
@@ -742,10 +797,10 @@ export class ElectronBrowserSession {
     for (const { target, event, listener } of this.listeners.splice(0)) {
       target.off(event, listener)
     }
-    if (this.webContents.debugger.isAttached()) {
+    if (!this.webContents.isDestroyed() && this.webContents.debugger.isAttached()) {
       this.webContents.debugger.detach()
     }
-    this.webContents.stop()
+    if (!this.webContents.isDestroyed()) this.webContents.stop()
     this.view.setVisible(false)
     if (this.view.nativeView) {
       this.parentWindow?.contentView?.removeChildView(this.view.nativeView)

tests/browser-tabs-electron-e2e.ts

@@ -7,6 +7,7 @@ import { StreamableHTTPClientTransport } from '@modelcontextprotocol/sdk/client/
 import type { KnowledgeService } from '../src/main/knowledge/knowledge-service'
 import { KnowledgeMcpGateway } from '../src/main/agent/knowledge-mcp-gateway'
 import { BrowserService } from '../src/main/browser/browser-service'
+import { BrowserModelTools } from '../src/main/browser/browser-model-tools'
 import type { BrowserLiveState } from '../src/shared/contracts'
 
 const conversationId = 'browser-tabs-electron-e2e'
@@ -31,6 +32,10 @@ async function main(): Promise<void> {
       response.end(page('Cookie page', '<p id="cookie"></p><script>document.querySelector("#cookie").textContent = document.cookie</script>'))
       return
     }
+    if (request.url === '/popups') {
+      response.end(page('Popup opener', '<a target="_blank" href="/popup-target">Open target</a><button onclick="window.child=window.open(\'/popup-script\')">Open script</button><button onclick="window.child=window.open();child.location=\'/popup-blank\'">Open blank</button>'))
+      return
+    }
     response.end(page(request.url === '/mcp' ? 'MCP target' : request.url === '/second' ? 'Second tab' : 'First tab'))
   })
   await new Promise<void>((resolve, reject) => {
@@ -241,6 +246,79 @@ async function main(): Promise<void> {
     await browser.closeTab(conversationId, second.tabId, window.webContents.id)
     assert.equal(browser.getTabCount(conversationId), 0)
     console.log('Real Electron browser-tab and MCP E2E passed')
+
+    await client.close()
+    client = undefined
+    const opener = await browser.createTab(conversationId, window.webContents.id)
+    await browser.navigate(conversationId, `${origin}/popups`, controller.signal, opener.tabId)
+    browser.setViewport(conversationId, bounds, opener.tabId, 'popup-viewport', window.webContents.id)
+    window.show()
+    const openerContents = webContents.getAllWebContents().find((contents) => contents.getURL() === `${origin}/popups`)
+    assert(openerContents)
+    openerContents.focus()
+    await openerContents.executeJavaScript('new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)))')
+    const popupUsage = browser.acquireTabUsage(conversationId, opener.tabId, 'popup-e2e')
+    token = gateway.grant('popup-e2e', [], controller.signal, 'none', undefined, conversationId, opener.tabId, popupUsage)
+    assert(token)
+    client = new Client({ name: 'popup-e2e', version: '1.0.0' })
+    await client.connect(new StreamableHTTPClientTransport(new URL(gateway.getEndpoint()!), {
+      requestInit: { headers: { Authorization: `Bearer ${token}` } }
+    }))
+    const snapshot = await browser.snapshot(conversationId, controller.signal, opener.tabId)
+    const link = snapshot.nodes.find((node) => node.name === 'Open target')
+    assert(link)
+    const clickResult = await client.callTool({ name: 'browser_click', arguments: { ref: link.ref } })
+    assert.notEqual(clickResult.isError, true, JSON.stringify(clickResult))
+    assert.match(JSON.stringify(clickResult), /openedTabId/u)
+    const popup = browser.listTabs(conversationId).find((tab) => tab.tabId !== opener.tabId)
+    assert(popup)
+    assert.equal(popup.workbarInstanceId, popup.tabId)
+    const popupSnapshot = await client.callTool({ name: 'browser_snapshot', arguments: {} })
+    assert.notEqual(popupSnapshot.isError, true, JSON.stringify(popupSnapshot))
+    assert.match(JSON.stringify(popupSnapshot), /popup-target/u)
+    assert.equal(browser.listTabs(conversationId).find((tab) => tab.tabId === opener.tabId)?.url, `${origin}/popups`)
+    const popupContents = webContents.getAllWebContents().find((contents) => contents.getURL() === `${origin}/popup-target`)
+    assert(popupContents)
+    assert.equal(await popupContents.executeJavaScript('typeof process'), 'undefined')
+    const popupDestroyed = once(popupContents, 'destroyed', { signal: AbortSignal.timeout(5_000) })
+    await popupContents.executeJavaScript('window.close()').catch(() => undefined)
+    await popupDestroyed
+    assert.equal(browser.getTabCount(conversationId), 1)
+    assert.equal((await client.callTool({ name: 'browser_snapshot', arguments: {} })).isError, true)
+    for (const path of ['/popup-script', '/popup-blank']) {
+      const navigation = new Promise<void>((resolve) => {
+        const remove = browser.onState((state) => {
+          if (state.url === `${origin}${path}`) { remove(); resolve() }
+        })
+      })
+      await openerContents.executeJavaScript(path === '/popup-blank'
+        ? `window.child=window.open();child.location='${path}';void 0`
+        : `window.child=window.open('${path}');void 0`)
+      await navigation
+      assert.equal(await openerContents.executeJavaScript('child !== null && !child.closed'), true)
+      const child = webContents.getAllWebContents().find((contents) => contents.getURL() === `${origin}${path}`)
+      assert(child)
+      const destroyedChild = once(child, 'destroyed', { signal: AbortSignal.timeout(5_000) })
+      await openerContents.executeJavaScript('child.close()')
+      await destroyedChild
+      assert.equal(browser.getTabCount(conversationId), 1)
+    }
+    assert.equal(await openerContents.executeJavaScript('window.open("file:///unsupported") === null'), true)
+    assert.equal(browser.getTabCount(conversationId), 1)
+    const directTools = new BrowserModelTools({ service: browser, conversationId, browserTabId: opener.tabId, recoverClosedTab: true })
+    const directSnapshot = await browser.snapshot(conversationId, controller.signal, opener.tabId)
+    const button = directSnapshot.nodes.find((node) => node.name === 'Open script' && node.role === 'button')
+    assert(button)
+    assert.match(JSON.stringify(await directTools.callTool('browser_click', { ref: button.ref }, controller.signal)), /openedTabId/u)
+    assert.match(JSON.stringify(await directTools.callTool('browser_snapshot', {}, controller.signal)), /popup-script/u)
+    const childContents = webContents.getAllWebContents().find((contents) => contents.getURL() === `${origin}/popup-script`)
+    assert(childContents)
+    assert.equal(childContents.session, openerContents.session)
+    await browser.closeTab(conversationId, opener.tabId)
+    assert.equal(childContents.isDestroyed(), false)
+    assert.match(JSON.stringify(await directTools.callTool('browser_snapshot', {}, controller.signal)), /popup-script/u)
+    await browser.releaseConversation(conversationId)
+    console.log('Native target=_blank, window.open(url), blank-then-location, script close, opener close, shared partition, URL denial and direct/MCP popup binding passed')
   } finally {
     if (token) gateway.revoke(token)
     await client?.close().catch(() => undefined)