diff --git a/packages/client/ui-dockkit/src/components/TabLayout.tsx b/packages/client/ui-dockkit/src/components/TabLayout.tsx
index 36f37a4ab2..1bb41b353d 100644
--- a/packages/client/ui-dockkit/src/components/TabLayout.tsx
+++ b/packages/client/ui-dockkit/src/components/TabLayout.tsx
@@ -46,23 +46,24 @@ function TabHost({ state, callbacks, intents, tab, pane, column, floats, focusRe
   const host = useRef<HTMLElement | null>(null)
   const body = useRef<HTMLDivElement | null>(null)
   useLayoutEffect(() => {
-    if (host.current !== null) host.current.inert = !visible
+    // Both refs target unconditional descendants attached before these effects.
+    const section = host.current as HTMLElement
+    section.inert = !visible
     const focused = document.activeElement
-    if (!visible && focused instanceof HTMLElement && host.current?.contains(focused)) focused.blur()
+    if (!visible && focused instanceof HTMLElement && section.contains(focused)) focused.blur()
     const request = focusRequest.current
     if (!visible || request?.tabId !== tab.id) return
     focusRequest.current = undefined
     // Preserve deliberate focus taken by another control or the newly shown body.
     if (focused !== null && focused !== document.body && focused !== document.documentElement && focused !== request.origin) return
-    const strip = host.current?.querySelector('[data-dockkit-strip]')
+    const strip = section.querySelector('[data-dockkit-strip]')
     const chip = [...strip?.querySelectorAll<HTMLElement>('[data-dockkit-tab]') ?? []]
       .find(element => element.dataset.dockkitTab === tab.id)
     chip?.focus({ preventScroll: true })
   }, [visible, tab.id, focusRequest])
   // Electron emits a non-bubbling focus event on the webview element.
   useEffect(() => {
-    const element = body.current
-    if (element === null) return
+    const element = body.current as HTMLDivElement
     const focus = (): void => {
       if (!visible) return
       if (floating) floats.raise(pane.id)
diff --git a/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
index 7874de6c37..8a884ba72a 100644
--- a/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
+++ b/packages/client/ui-dockkit/tests/tab-layout.client.spec.tsx
@@ -84,9 +84,17 @@ it('keeps body ancestors through pane moves, floating, raising and docking', ()
   fireEvent.pointerDown(h.node('[data-dockkit-divider]'), { button: 0, pointerId: 1 })
   expect(h.callbacks.onDividerPressed).toHaveBeenCalledOnce()
   h.redraw({ preview: undefined })
+  const secondPane = getPane(state, split.children[1]!).id
+  fireEvent.click(h.node(`[data-dockkit-content="${tab}"] [data-dockkit-tab="${tab}"]`))
+  expect(controller.getSnapshot().state.activePaneId).toBe(split.children[0])
+  act(() => { controller.focusPane(secondPane); h.redraw() })
+  fireEvent.focus(body)
+  expect(controller.getSnapshot().state.activePaneId).toBe(split.children[0])
+  act(() => { controller.focusPane(secondPane); h.redraw() })
+  fireEvent.pointerDown(h.node(`[data-dockkit-content="${tab}"]`), { button: 0, pointerId: 1 })
+  fireEvent.click(body)
   fireEvent.focus(body)
   expect(controller.getSnapshot().state.activePaneId).toBe(getPane(state, split.children[0]!).id)
-  const secondPane = getPane(state, split.children[1]!).id
   act(() => { controller.placeTab(tab, secondPane, 0); h.redraw() })
   expect(h.body(tab)).toBe(body)
   expect(body.closest('[data-dockkit-host]')).toBe(host)
@@ -97,6 +105,7 @@ it('keeps body ancestors through pane moves, floating, raising and docking', ()
   act(() => { controller.setExpanded(false); h.redraw() })
   expect(body.closest('[data-dockkit-content]')?.getAttribute('aria-hidden')).toBeNull()
   fireEvent.pointerDown(h.node(`[data-dockkit-float="${floating}"]`), { pointerId: 1, button: 0 })
+  fireEvent.click(h.node(`[data-dockkit-float="${floating}"]`))
   fireEvent.focus(body)
   const resize = h.node('[data-dockkit-float-resize]')
   fireEvent.pointerDown(resize, { pointerId: 2, button: 0, clientX: 500, clientY: 400 })
@@ -125,6 +134,47 @@ it('unmounts unretained bodies and restores focus to their replacement strip', (
   expect(focus).toHaveBeenCalled()
 })
 
+it.for(['new-control', 'origin-control', 'document', 'no-focus'] as const)('transfers tab focus without overriding a new owner: %s', (kind, test) => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller)
+  const control = document.createElement('button')
+  document.body.append(control)
+  test.onTestFinished(() => { control.remove() })
+  if (kind === 'origin-control') control.focus()
+  vi.spyOn(h.callbacks, 'onFocusTab').mockImplementation((id) => {
+    if (kind === 'new-control') control.focus()
+    if (kind === 'document' || kind === 'no-focus') {
+      vi.spyOn(document, 'activeElement', 'get').mockReturnValue(kind === 'document' ? document.documentElement : null)
+    }
+    controller.focusTab(id)
+    h.redraw()
+  })
+  const focus = vi.spyOn(HTMLElement.prototype, 'focus')
+  fireEvent.click(h.node(`[data-dockkit-tab="${second}"]`))
+  if (kind === 'new-control') expect(document.activeElement).toBe(control)
+  else expect(focus).toHaveBeenCalledWith({ preventScroll: true })
+})
+
+it('does not require a docked strip when a selected tab becomes floating in the same update', () => {
+  const controller = seededController()
+  controller.setExpanded(true)
+  const first = getPane(controller.getSnapshot().state, controller.getSnapshot().state.rootId).tabs[0]!
+  const second = controller.openContent({ kind: 'file', contentId: 'file:b', title: 'B' })
+  controller.focusTab(first)
+  const h = mounted(controller)
+  vi.spyOn(h.callbacks, 'onFocusTab').mockImplementation((id) => {
+    controller.focusTab(id)
+    controller.floatTab(id)
+    h.redraw()
+  })
+  fireEvent.click(h.node(`[data-dockkit-tab="${second}"]`))
+  expect(h.node(`[data-dockkit-content="${second}"]`).hasAttribute('data-dockkit-float')).toBe(true)
+})
+
 it('renders an empty pane and rejects unsupported docked trees', () => {
   const controller = new DockController()
   controller.setExpanded(true)
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
index 521bd0d761..45d17bb259 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/BrowserController.ts
@@ -233,7 +233,6 @@ export function createBrowserControllers(actions: BoundActions<BrowserStore>, cr
         }
         const created = new BrowserController({ ...request, actions: currentActions, createPage })
         const forget = (): void => {
-          if (controllers.get(tabId)?.controller !== created) return
           controllers.delete(tabId)
           // Plugin unload also aborts occurrences; only layout removal deletes saved navigation.
           if (!isTabOpen(tabId)) currentActions.forget(tabId)
diff --git a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
index 2de462ef1e..0692b80997 100644
--- a/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
+++ b/packages/client/ui-sidebar-browser/src/client/browser/IframeImpl.ts
@@ -78,9 +78,7 @@ export class IframeImpl implements BrowserFrame {
       this.store.set({ ...this.store.getSnapshot(), sandboxEnabled: enabled })
       return
     }
-    const request = this.navigation.reload()
-    if (request === undefined) this.publish()
-    else this.load(request)
+    this.load(this.navigation.reload())
   }
 
   private load(request: ReturnType<BrowserNavigation['navigate']> | undefined): void {
diff --git a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
index 9ea53f03eb..7c5a7e455b 100644
--- a/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
+++ b/packages/client/ui-sidebar-browser/src/client/view/BrowserBody.tsx
@@ -94,7 +94,7 @@ export function BrowserBody(props: BrowserBodyProps): ReactNode {
           <button type="submit" className={[css.tool, css.addressGo].join(' ')} aria-label={t('go')} title={t('go')}><IconLinkOutlineRegular /></button>
         </div>
         <button type="button" className={css.tool} aria-label={t('external')} title={t('external')} disabled={externalUrl === undefined}
-          onClick={() => { if (externalUrl !== undefined) window.open(externalUrl, '_blank', 'noopener,noreferrer') }}
+          onClick={externalUrl === undefined ? undefined : () => { window.open(externalUrl, '_blank', 'noopener,noreferrer') }}
         ><IconRightUpOutlineRegular size={14} /></button>
         {sandboxed !== undefined && <button
           type="button"
diff --git a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
index 5659489224..311138f63e 100644
--- a/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/apply.client.spec.ts
@@ -1,3 +1,4 @@
+// @vitest-environment jsdom
 /** Browser type, Slot, locale, and HMR disposal through the real registries. */
 import { afterEach, describe, expect, it, vi } from 'vitest'
 import { Context } from '@deepseek-ai/cordis'
@@ -9,11 +10,15 @@ import type { BrowserInjected } from '../src/client/browser/BrowserController.ts
 import { BROWSER_ID, BROWSER_KIND } from '../src/client/definition.tsx'
 import { apply, inject } from '../src/client/index.ts'
 import { en, zh } from '../src/client/locales.ts'
+import { createBrowserStore } from '../src/client/browser/store.ts'
+import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
+import type { DesktopBrowserBridge, DesktopBrowserLeaseId } from '../src/types.ts'
 
 const contexts: Context[] = []
 
 afterEach(async () => {
   await Promise.all(contexts.splice(0).map(ctx => ctx.fiber.dispose()))
+  vi.unstubAllGlobals()
 })
 
 interface Recorded {
@@ -47,15 +52,65 @@ async function boot() {
     }),
   }
   ctx.provide('sidebarRightTabs', tabs as never)
-  ctx.provide('sidebarRight', { openTabs: createSnapshotStore([]) } as never)
+  const openTabs = createSnapshotStore<readonly { sessionId: string; tabId: TabId }[]>([])
+  ctx.provide('sidebarRight', { openTabs } as never)
+  ctx.provide('workspaces', { list: createSnapshotStore({ phase: 'ready', items: [] }) } as never)
   ctx.provide('slots', slots as never)
   ctx.provide('locale', locale as never)
   const fiber = ctx.plugin({ inject: [...inject], apply })
   await fiber.await()
-  return { tabs, registered, dictionaries, fiber }
+  return { tabs, registered, dictionaries, fiber, openTabs }
 }
 
 describe('ui-sidebar-browser apply', () => {
+  it.each([0, 1])('binds and rebinds session controllers under desktop protocol %s', async (protocolVersion) => {
+    const acquire = vi.fn(async () => ({ lease: 'test-lease' as DesktopBrowserLeaseId, partition: 'test-partition' }))
+    const bridge: DesktopBrowserBridge = {
+      acquire,
+      release: vi.fn(async () => {}),
+      onOpenRequested: vi.fn(() => () => {}),
+    }
+    vi.stubGlobal('dshDesktop', { protocolVersion, browser: bridge })
+    const h = await boot()
+    expect(h.tabs.get(BROWSER_KIND)?.keepMounted).toBe(protocolVersion === 1)
+    const injectFace = h.registered.find(entry => entry.name === 'sidebar.right.pane.tab')!.inject as
+      (sessionId: string, actions: Parameters<BrowserInjected['rebind']>[0]) => BrowserInjected
+    const firstStore = createBrowserStore().create(`apply-first-${protocolVersion}`)
+    const replacementStore = createBrowserStore().create(`apply-replacement-${protocolVersion}`)
+    const controller = injectFace('session', firstStore.actions)
+    expect(injectFace('session', replacementStore.actions)).toBe(controller)
+    const host = document.createElement('div')
+    host.id = `browser-apply-${protocolVersion}`
+    document.body.append(host)
+    const signal = new AbortController()
+    const tabId = 'apply-tab' as TabId
+    try {
+      controller.mount({ tabId, signal: signal.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: 'https://example.test/', openTab: vi.fn() })
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeDefined()
+      expect(firstStore.getSnapshot().byTab[tabId]).toBeUndefined()
+      if (protocolVersion === 1) await vi.waitFor(() => { expect(acquire).toHaveBeenCalledWith('session:session') })
+      else expect(host.querySelector('iframe')).not.toBeNull()
+      h.openTabs.set([{ sessionId: 'other', tabId }, { sessionId: 'session', tabId: 'other-tab' as TabId }])
+      signal.abort()
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeUndefined()
+      const reopened = new AbortController()
+      controller.mount({ tabId, signal: reopened.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: 'https://retained.example/', openTab: vi.fn() })
+      h.openTabs.set([{ sessionId: 'session', tabId }])
+      reopened.abort()
+      expect(replacementStore.getSnapshot().byTab[tabId]).toBeDefined()
+      const active = new AbortController()
+      controller.mount({ tabId, signal: active.signal, viewportId: host.id, applicationOrigin: 'https://dsh.example',
+        initial: undefined, initialUrl: undefined, openTab: vi.fn() })
+      await h.fiber.dispose()
+      expect(controller.keyedHooks.browserState(tabId)).toBeUndefined()
+    } finally {
+      await h.fiber.dispose()
+      host.remove()
+    }
+  })
+
   it('registers a multi-instance builtin and its body and title', async () => {
     const { tabs, registered, dictionaries } = await boot()
     const definition = tabs.get(BROWSER_KIND)
diff --git a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
index a062a29a15..09ca4e75d1 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
+++ b/packages/client/ui-sidebar-browser/tests/browser-body.client.spec.tsx
@@ -1,6 +1,6 @@
 // @vitest-environment jsdom
 import { afterEach, describe, expect, it, vi } from 'vitest'
-import { cleanup, fireEvent, render, waitFor } from '@testing-library/react'
+import { act, cleanup, fireEvent, render, waitFor } from '@testing-library/react'
 import { useSyncExternalStore } from 'react'
 import type { SessionId } from '@deepseek-ai/dsh-session/types'
 import type { PaneId, TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
@@ -11,6 +11,10 @@ import { BrowserBody } from '../src/client/view/BrowserBody.tsx'
 import { WEB_BROWSER_SANDBOX } from '../src/client/view/IframePresentation.ts'
 import { createIframePage } from '../src/client/pages.ts'
 import { zh } from '../src/client/locales.ts'
+import { browserAddressCheckpoint, type BrowserTabState } from '../src/client/browser/BrowserPersistence.ts'
+import type { BrowserPageFactory, BrowserPageOptions } from '../src/client/browser/BrowserPage.ts'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import { emptyBrowserFrame, type BrowserFrameState } from '../src/client/browser/BrowserFrame.ts'
 
 const SESSION = 'session' as SessionId
 const TAB = 'tab' as TabId
@@ -33,11 +37,13 @@ const absentState = {
   getSnapshot: (): BrowserControllerState | undefined => undefined,
 }
 
-function mountBrowser(navigation?: { readonly url?: string }) {
+function mountBrowser(navigation?: { readonly url?: string },
+  options: { initial?: BrowserTabState; createPage?: BrowserPageFactory } = {}) {
   const store = createBrowserStore().create(`browser-body-test-${String(++mountSequence)}`)
+  if (options.initial !== undefined) store.actions.replace(TAB, options.initial)
   const lifetime = new AbortController()
   lifetimes.add(lifetime)
-  const injected = createBrowserControllers(store.actions, createIframePage, () => true)
+  const injected = createBrowserControllers(store.actions, options.createPage ?? createIframePage, () => true)
   controllers.push(injected)
   const { keyedHooks, ...commands } = injected
   const tabActions = { openResource: vi.fn(), openTab: vi.fn(), close: vi.fn() }
@@ -67,7 +73,7 @@ function mountBrowser(navigation?: { readonly url?: string }) {
     }
   const renderBody = () => render(<BrowserBody {...props as BrowserBodyProps} />)
   return {
-    view: renderBody(), remount: renderBody, store, lifetime, injected,
+    view: renderBody(), remount: renderBody, store, lifetime, injected, tabActions,
   }
 }
 
@@ -81,6 +87,39 @@ afterEach(async () => {
 })
 
 describe('BrowserBody', () => {
+  it('shows the saved title and URL without loading until Restore is clicked', async () => {
+    const target = { kind: 'https' as const, url: 'https://saved.example/page', title: 'Saved title' }
+    const mounted = mountBrowser(undefined, { initial: browserAddressCheckpoint(target, 1) })
+    expect(mounted.view.getByText(target.title)).toBeDefined()
+    expect(mounted.view.getByText(target.url)).toBeDefined()
+    expect(mounted.view.container.querySelector('iframe')).toBeNull()
+    expect(mounted.view.getByRole('button', { name: zh.reload })).toHaveProperty('disabled', false)
+    fireEvent.click(mounted.view.getByRole('button', { name: zh['restore.action'] }))
+    await waitFor(() => { expect(mounted.view.container.querySelector('iframe')?.src).toBe(target.url) })
+    expect(mounted.view.queryByText(target.title)).toBeNull()
+  })
+
+  it('renders native error details and routes provider open requests through the source tab', () => {
+    const state = createSnapshotStore<BrowserFrameState>({ ...emptyBrowserFrame(), error: { code: -105, description: 'DNS failure' } })
+    const providers: BrowserPageOptions[] = []
+    const mounted = mountBrowser(undefined, { createPage: (options) => {
+      providers.push(options)
+      return {
+        presentation: { mount: () => () => {} },
+        frame: { getSnapshot: () => state.getSnapshot(), subscribe: listener => state.subscribe(listener),
+          loadUrl: vi.fn(), goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), dispose: async () => {} },
+      }
+    } })
+    expect(mounted.view.getByRole('status').textContent).toContain('DNS failure')
+    expect(mounted.view.getByRole('status').textContent).toContain('-105')
+    act(() => { state.set({ ...state.getSnapshot(), error: { code: -105, description: undefined } }) })
+    expect(mounted.view.getByRole('status').textContent).toBe(zh['load.failed'])
+    act(() => { providers[0]!.openRequested('https://new.example/') })
+    expect(mounted.tabActions.openTab).toHaveBeenCalledExactlyOnceWith('browser', {
+      params: { url: 'https://new.example/' }, revealIfOpened: false,
+    })
+  })
+
   it('routes address input to the controller and renders parser failures', async () => {
     const mounted = mountBrowser()
     const input = mounted.view.getByRole('textbox')
diff --git a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
index 5c513a557f..f3b09fb9e5 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-controller.client.spec.ts
@@ -4,6 +4,10 @@ import type { TabId } from '@deepseek-ai/dsh-client-ui-dockkit'
 import { BrowserController, createBrowserControllers } from '../src/client/browser/BrowserController.ts'
 import { createBrowserStore } from '../src/client/browser/store.ts'
 import { createIframePage } from '../src/client/pages.ts'
+import type { BrowserPageFactory, BrowserPageOptions } from '../src/client/browser/BrowserPage.ts'
+import { browserAddressCheckpoint } from '../src/client/browser/BrowserPersistence.ts'
+import { createSnapshotStore } from '@deepseek-ai/dsh-client-store'
+import { emptyBrowserFrame, type BrowserFrameState } from '../src/client/browser/BrowserFrame.ts'
 
 const TAB = 'tab' as TabId
 const APP = 'https://dsh.example'
@@ -50,6 +54,91 @@ afterEach(async () => {
 })
 
 describe('BrowserController', () => {
+  it('restores only on request and redirects saved checkpoints to a replacement binding', () => {
+    const h = harness()
+    const saved = browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved page' }, 2)
+    h.store.actions.replace(TAB, saved)
+    const tabLifetime = lifetime()
+    h.mount(tabLifetime.signal)
+    const state = h.face.keyedHooks.browserState(TAB)!
+    expect(state.getSnapshot().restoreTarget?.title).toBe('Saved page')
+    expect(state.getSnapshot().frame.target).toBeUndefined()
+    const rebound = createBrowserStore().create('rebound-browser-controller')
+    h.face.rebind(rebound.actions)
+    h.mount(tabLifetime.signal)
+    expect(rebound.getSnapshot().byTab[TAB]).toEqual(saved)
+    h.face.restore(TAB)
+    expect(h.iframe().src).toBe('https://saved.example/')
+    h.face.restore(TAB)
+    h.face.loadUrl(TAB, 'https://next.example/')
+    expect(rebound.getSnapshot().byTab[TAB]?.entries.at(-1)?.url).toBe('https://next.example/')
+    expect(h.store.getSnapshot().byTab[TAB]).toEqual(saved)
+    tabLifetime.abort()
+    expect(rebound.getSnapshot().byTab[TAB]).toBeDefined()
+    h.face.restore(TAB)
+    h.face.setSandbox(TAB, false)
+    h.mount(tabLifetime.signal)()
+    expect(h.face.keyedHooks.browserState(TAB)).toBeUndefined()
+  })
+
+  it('refresh restores a saved page and ignores cancellation from a retired physical mount', () => {
+    const h = harness()
+    h.store.actions.replace(TAB, browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved' }, 1))
+    const tabLifetime = lifetime()
+    const oldMount = h.mount(tabLifetime.signal)
+    h.face.reload(TAB)
+    const secondHost = document.createElement('div')
+    secondHost.id = 'replacement-browser-host'
+    document.body.append(secondHost)
+    hosts.push(secondHost)
+    h.face.mount({ tabId: TAB, signal: tabLifetime.signal, viewportId: secondHost.id,
+      applicationOrigin: APP, initial: undefined, initialUrl: undefined, openTab: vi.fn() })
+    oldMount()
+    expect(secondHost.querySelector('iframe')?.src).toBe('https://saved.example/')
+    expect(() => h.face.mount({ tabId: TAB, signal: tabLifetime.signal, viewportId: 'missing-browser-host',
+      applicationOrigin: APP, initial: undefined, initialUrl: undefined, openTab: vi.fn() })).toThrow('not mounted')
+  })
+
+  it('validates provider open requests and ignores late provider callbacks after disposal', async () => {
+    const saved = browserAddressCheckpoint({ kind: 'https', url: 'https://saved.example/', title: 'Saved' }, 1)
+    const frames = createSnapshotStore<BrowserFrameState>(emptyBrowserFrame())
+    const callbacks: BrowserPageOptions[] = []
+    const pendingNotifications: (() => void)[] = []
+    const pageFactory: BrowserPageFactory = (options) => {
+      callbacks.push(options)
+      return {
+        frame: { getSnapshot: () => frames.getSnapshot(), subscribe: (listener) => {
+          pendingNotifications.push(listener)
+          return frames.subscribe(listener)
+        }, loadUrl: vi.fn(), goBack: vi.fn(), goForward: vi.fn(), reload: vi.fn(), dispose: async () => {} },
+        presentation: { mount: () => () => {}, dispose: () => {} },
+      }
+    }
+    const store = createBrowserStore().create('provider-callbacks')
+    const openTab = vi.fn()
+    const controller = new BrowserController({ tabId: TAB, signal: lifetime().signal, applicationOrigin: APP,
+      actions: store.actions, initial: saved, createPage: pageFactory, openTab })
+    disposables.push(controller)
+    const provider = callbacks[0]!
+    provider.openRequested('file:/secret')
+    expect(controller.getSnapshot().addressFailure).toBe('protocol')
+    provider.openRequested('https://new.example/path')
+    expect(openTab).toHaveBeenCalledExactlyOnceWith('https://new.example/path')
+    controller.setSandbox(false)
+    frames.set({ ...emptyBrowserFrame(), loading: true })
+    expect(controller.getSnapshot().restoreTarget?.title).toBe('Saved')
+    expect(controller.getSnapshot().addressFailure).toBe('protocol')
+    const before = controller.getSnapshot()
+    await controller.dispose()
+    controller.start('https://ignored.example/')
+    provider.persist(saved)
+    provider.openRequested('https://ignored.example/')
+    for (const notify of pendingNotifications) notify()
+    expect(controller.getSnapshot()).toBe(before)
+    expect(store.getSnapshot().byTab[TAB]).toBeUndefined()
+    expect(openTab).toHaveBeenCalledOnce()
+  })
+
   it('ignores navigation commands after its tab occurrence ends', async () => {
     const store = createBrowserStore().create('browser-controller-ended-test')
     const tabLifetime = lifetime()
diff --git a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
index 351de080fd..8ef82c7665 100644
--- a/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
+++ b/packages/client/ui-sidebar-browser/tests/browser-frame.client.spec.ts
@@ -17,6 +17,9 @@ describe('IframeImpl', () => {
     const listener = vi.fn()
     const unsubscribe = frame.subscribe(listener)
     try {
+      frame.handleLoaded(0)
+      expect(frame.getSnapshot().address).toBe('empty')
+      frame.sandbox.setEnabled(false)
       frame.sandbox.setEnabled(false)
       expect(frame.getSnapshot().sandboxEnabled).toBe(false)
       expect(frame.getSnapshot().target).toBeUndefined()
@@ -43,6 +46,10 @@ describe('IframeImpl', () => {
       frame.handleLoadFailed(2)
       frame.handleLoaded(2)
       frame.reload()
+      frame.loadUrl(target)
+      frame.goBack()
+      frame.goForward()
+      frame.sandbox.setEnabled(true)
       expect(frame.getSnapshot()).toBe(stopped)
     } finally {
       unsubscribe()
diff --git a/packages/client/ui-sidebar-right/src/client/session-views.ts b/packages/client/ui-sidebar-right/src/client/session-views.ts
index 04f4122094..232b310755 100644
--- a/packages/client/ui-sidebar-right/src/client/session-views.ts
+++ b/packages/client/ui-sidebar-right/src/client/session-views.ts
@@ -73,7 +73,6 @@ export class SidebarSessionViews {
   }
 
   private publish(): void {
-    if (this.closed) return
     this.source.set([...this.views.values()].sort((a, b) => a.sessionId.localeCompare(b.sessionId)).map(view => ({
       sessionId: view.sessionId, reference: view.reference, selected: view.sessionId === this.selected, retainTab: view.retainTab,
     })))