diff --git a/src/main/browser/extensions/browser-extension-install-prompt.ts b/src/main/browser/extensions/browser-extension-install-prompt.ts
index 3dc3dba1875..bdacf6c7c74 100644
--- a/src/main/browser/extensions/browser-extension-install-prompt.ts
+++ b/src/main/browser/extensions/browser-extension-install-prompt.ts
@@ -47,8 +47,8 @@ export function requestBrowserExtensionInstallPrompt(
       for (const contents of watched) {
         contents.removeListener('destroyed', decline)
         contents.removeListener('render-process-gone', decline)
+        contents.removeListener('did-navigate', decline)
       }
-      guest?.removeListener('did-navigate', decline)
       try {
         if (!renderer.isDestroyed()) {
           renderer.send(BROWSER_EXTENSION_INSTALL_PROMPT_CLOSED_CHANNEL, { requestId })
@@ -63,9 +63,9 @@ export function requestBrowserExtensionInstallPrompt(
     for (const contents of watched) {
       contents.once('destroyed', decline)
       contents.once('render-process-gone', decline)
+      // Why did-navigate: committed top-frame documents only, not store or Settings SPA routes.
+      contents.once('did-navigate', decline)
     }
-    // Why did-navigate: it fires only for committed cross-document top-frame loads, not store SPA routes.
-    guest?.once('did-navigate', decline)
     try {
       renderer.send(BROWSER_EXTENSION_INSTALL_PROMPT_REQUESTED_CHANNEL, { ...prompt, requestId })
     } catch {
diff --git a/src/main/browser/extensions/browser-extension-settings-prompt-lifetime.test.ts b/src/main/browser/extensions/browser-extension-settings-prompt-lifetime.test.ts
new file mode 100644
index 00000000000..d888fd9ea02
--- /dev/null
+++ b/src/main/browser/extensions/browser-extension-settings-prompt-lifetime.test.ts
@@ -0,0 +1,210 @@
+import { EventEmitter } from 'node:events'
+import { mkdtempSync, readdirSync, rmSync } from 'node:fs'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { strToU8, zipSync } from 'fflate'
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import {
+  BROWSER_EXTENSION_INSTALL_PROMPT_REQUESTED_CHANNEL,
+  type BrowserExtensionWebStoreInstallResult
+} from '../../../shared/browser-extension-webstore'
+import type * as PromptModule from './browser-extension-install-prompt'
+import type * as ServiceModule from './browser-extension-webstore-service'
+import type * as InstallModule from './browser-extension-webstore-install'
+
+const state = vi.hoisted(() => ({
+  userData: '',
+  load: vi.fn(async () => {}),
+  download: vi.fn()
+}))
+
+vi.mock('electron', () => ({
+  app: { getPath: () => state.userData },
+  webContents: { fromId: () => null }
+}))
+vi.mock('../browser-manager', () => ({ browserManager: {} }))
+vi.mock('../browser-session-registry', () => ({
+  browserSessionRegistry: {
+    getProfile: () => ({ label: 'Work' }),
+    getEnabledExtensionIds: () => [],
+    updateEnabledExtensionIds: vi.fn()
+  }
+}))
+vi.mock('./browser-extension-management', () => ({ removeBrowserExtension: vi.fn() }))
+vi.mock('./browser-extension-session-loader', () => ({
+  getBrowserExtensionSessionForProfile: () => ({}),
+  loadBrowserExtensionIntoProfile: () => state.load(),
+  unloadBrowserExtensionEverywhere: vi.fn()
+}))
+vi.mock('./browser-extension-support', () => ({ isBrowserExtensionSupportEnabled: () => true }))
+vi.mock('./browser-extension-webstore-download', () => ({
+  downloadWebStoreCrx: () => state.download(),
+  fetchWebStoreIconDataUrl: vi.fn(),
+  isAllowedWebStoreIconUrl: vi.fn()
+}))
+vi.mock('./browser-extension-webstore-events', () => ({
+  notifyChromeWebStoreInstalled: vi.fn(),
+  notifyChromeWebStoreUninstalled: vi.fn()
+}))
+vi.mock('./browser-extension-load-directory', () => ({
+  refuseOrcaFileCollisions: vi.fn(async () => {})
+}))
+vi.mock('./browser-extension-held-updates', () => ({
+  forgetHeldBrowserExtensionUpdate: vi.fn(),
+  getHeldBrowserExtensionUpdate: () => null
+}))
+vi.mock('./browser-extension-list-changes', () => ({ notifyBrowserExtensionListChanged: vi.fn() }))
+vi.mock('./browser-extension-profile-reload', () => ({
+  reloadBrowserExtensionWhereEnabled: vi.fn()
+}))
+
+const extensionId = 'a'.repeat(32)
+const renderers: EventEmitter[] = []
+const installs: Promise<BrowserExtensionWebStoreInstallResult>[] = []
+let service: typeof ServiceModule
+let prompt: typeof PromptModule
+let install: typeof InstallModule
+
+function renderer() {
+  const contents = Object.assign(new EventEmitter(), {
+    id: 41,
+    isDestroyed: () => false,
+    send: vi.fn<(channel: string, payload: { requestId: string }) => void>()
+  })
+  renderers.push(contents)
+  return contents
+}
+
+function asContents(contents: ReturnType<typeof renderer>): Electron.WebContents {
+  // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: the prompt reads only these EventEmitter methods, id, isDestroyed and send.
+  return contents as unknown as Electron.WebContents
+}
+
+function start(contents: ReturnType<typeof renderer>) {
+  const pending = service.installBrowserExtensionFromWebStore(
+    'work',
+    extensionId,
+    asContents(contents)
+  )
+  installs.push(pending)
+  return pending
+}
+
+async function requested(contents: ReturnType<typeof renderer>): Promise<{ requestId: string }> {
+  await vi.waitFor(() =>
+    expect(contents.send).toHaveBeenCalledWith(
+      BROWSER_EXTENSION_INSTALL_PROMPT_REQUESTED_CHANNEL,
+      expect.objectContaining({ kind: 'install', name: 'Vault' })
+    )
+  )
+  const request = contents.send.mock.calls.find(
+    ([channel]) => channel === BROWSER_EXTENSION_INSTALL_PROMPT_REQUESTED_CHANNEL
+  )?.[1]
+  if (!request) {
+    throw new Error('Install prompt missing')
+  }
+  return request
+}
+
+function stagedFolders(): string[] {
+  return readdirSync(join(state.userData, 'browser-extensions', extensionId)).filter((name) =>
+    name.startsWith('.staging-')
+  )
+}
+
+beforeEach(async () => {
+  state.userData = mkdtempSync(join(tmpdir(), 'orca-settings-prompt-'))
+  state.load.mockReset()
+  state.load.mockResolvedValue(undefined)
+  state.download.mockReset()
+  state.download.mockResolvedValue({
+    extensionId,
+    publicKey: Buffer.from('verified-download-key'),
+    archive: Buffer.from(
+      zipSync({
+        'manifest.json': strToU8(
+          JSON.stringify({
+            name: 'Vault',
+            version: '1.0',
+            manifest_version: 3,
+            permissions: ['storage']
+          })
+        )
+      })
+    )
+  })
+  vi.resetModules()
+  service = await import('./browser-extension-webstore-service')
+  prompt = await import('./browser-extension-install-prompt')
+  install = await import('./browser-extension-webstore-install')
+})
+
+afterEach(async () => {
+  for (const contents of renderers.splice(0)) {
+    contents.emit('destroyed')
+  }
+  await Promise.all(installs.splice(0))
+  rmSync(state.userData, { recursive: true, force: true })
+})
+
+describe('Settings extension install prompt lifetime', () => {
+  it('discards staging and releases the install lock when the renderer reloads', async () => {
+    const contents = renderer()
+    const pending = start(contents)
+    const request = await requested(contents)
+    expect(stagedFolders()).toHaveLength(1)
+    expect(install.isBrowserExtensionBusy(extensionId)).toBe(true)
+
+    contents.emit('did-navigate', {}, 'file:///orca/index.html', 200, 'OK')
+
+    await vi.waitFor(() => expect(install.isBrowserExtensionBusy(extensionId)).toBe(false))
+    await expect(pending).resolves.toEqual({ status: 'cancelled' })
+    expect(stagedFolders()).toEqual([])
+    expect(install.isBrowserExtensionBusy(extensionId)).toBe(false)
+    expect(
+      prompt.respondToBrowserExtensionInstallPrompt(asContents(contents), {
+        requestId: request.requestId,
+        accepted: true
+      })
+    ).toBe(false)
+    for (const event of ['destroyed', 'render-process-gone', 'did-navigate']) {
+      expect(contents.listenerCount(event)).toBe(0)
+    }
+
+    const successor = renderer()
+    const retry = start(successor)
+    const next = await requested(successor)
+    prompt.respondToBrowserExtensionInstallPrompt(asContents(successor), {
+      requestId: next.requestId,
+      accepted: true
+    })
+    await expect(retry).resolves.toEqual({ status: 'installed', name: 'Vault' })
+    expect(install.isBrowserExtensionBusy(extensionId)).toBe(false)
+  })
+
+  it('finishes an accepted install when the renderer navigates during loading', async () => {
+    let finishLoading = (): void => {}
+    state.load.mockImplementation(
+      () =>
+        new Promise<void>((resolve) => {
+          finishLoading = resolve
+        })
+    )
+    const contents = renderer()
+    const pending = start(contents)
+    const request = await requested(contents)
+    prompt.respondToBrowserExtensionInstallPrompt(asContents(contents), {
+      requestId: request.requestId,
+      accepted: true
+    })
+    try {
+      await vi.waitFor(() => expect(state.load).toHaveBeenCalledOnce())
+      contents.emit('did-navigate', {}, 'file:///orca/index.html', 200, 'OK')
+      expect(install.isBrowserExtensionBusy(extensionId)).toBe(true)
+    } finally {
+      finishLoading()
+    }
+    await expect(pending).resolves.toEqual({ status: 'installed', name: 'Vault' })
+    expect(install.isBrowserExtensionBusy(extensionId)).toBe(false)
+  })
+})