diff --git a/browser_tests/fixtures/ComfyPage.ts b/browser_tests/fixtures/ComfyPage.ts
index d1e2f68a67..14a50607bd 100644
--- a/browser_tests/fixtures/ComfyPage.ts
+++ b/browser_tests/fixtures/ComfyPage.ts
@@ -108,6 +108,8 @@ class ConfirmDialog {
 }
 
 export class ComfyPage {
+  private _history: TaskHistory | null = null
+
   public readonly url: string
   // All canvas position operations are based on default view of canvas.
   public readonly canvas: Locator
@@ -242,7 +244,8 @@ export class ComfyPage {
   }
 
   setupHistory(): TaskHistory {
-    return new TaskHistory(this)
+    this._history ??= new TaskHistory(this)
+    return this._history
   }
 
   async setup({ clearStorage = true }: { clearStorage?: boolean } = {}) {
diff --git a/browser_tests/fixtures/components/SidebarTab.ts b/browser_tests/fixtures/components/SidebarTab.ts
index 28f1a37fa1..d222db5633 100644
--- a/browser_tests/fixtures/components/SidebarTab.ts
+++ b/browser_tests/fixtures/components/SidebarTab.ts
@@ -242,4 +242,21 @@ export class QueueSidebarTab extends SidebarTab {
       localStorage.setItem('queue', JSON.stringify([width, 100 - width]))
     }, width)
   }
+
+  getTaskPreviewButton(taskIndex: number) {
+    return this.tasks.nth(taskIndex).getByRole('button')
+  }
+
+  async openTaskPreview(taskIndex: number) {
+    const previewButton = this.getTaskPreviewButton(taskIndex)
+    await previewButton.hover()
+    await previewButton.click()
+    return this.getGalleryImage(taskIndex).waitFor({ state: 'visible' })
+  }
+
+  getGalleryImage(galleryItemIndex: number) {
+    // Aria labels of Galleria items are 1-based indices
+    const galleryLabel = `${galleryItemIndex + 1}`
+    return this.page.getByLabel(galleryLabel).locator('.galleria-image')
+  }
 }
diff --git a/browser_tests/menu.spec.ts b/browser_tests/menu.spec.ts
index 5365086c60..764a99223c 100644
--- a/browser_tests/menu.spec.ts
+++ b/browser_tests/menu.spec.ts
@@ -1,6 +1,9 @@
-import { expect } from '@playwright/test'
+import { expect, mergeTests } from '@playwright/test'
 
-import { comfyPageFixture as test } from './fixtures/ComfyPage'
+import { comfyPageFixture } from './fixtures/ComfyPage'
+import { webSocketFixture } from './fixtures/ws'
+
+const test = mergeTests(comfyPageFixture, webSocketFixture)
 
 test.describe('Menu', () => {
   test.beforeEach(async ({ comfyPage }) => {
@@ -873,4 +876,70 @@ test.describe('Queue sidebar', () => {
       expect(await comfyPage.menu.queueTab.visibleTasks.count()).toBe(1)
     })
   })
+
+  test.describe('Gallery', () => {
+    test.beforeEach(async ({ comfyPage }) => {
+      await comfyPage
+        .setupHistory()
+        .withTask(['example.webp'])
+        .repeat(1)
+        .setupRoutes()
+      await comfyPage.menu.queueTab.open()
+      await comfyPage.menu.queueTab.waitForTasks()
+    })
+
+    test('displays gallery image after opening task preview', async ({
+      comfyPage
+    }) => {
+      await comfyPage.menu.queueTab.openTaskPreview(0)
+      expect(comfyPage.menu.queueTab.getGalleryImage(0)).toBeVisible()
+    })
+
+    test('should maintain active gallery item when new tasks are added', async ({
+      comfyPage,
+      ws
+    }) => {
+      const initialIndex = 0
+      await comfyPage.menu.queueTab.openTaskPreview(initialIndex)
+
+      // Add a new task while the gallery is still open
+      comfyPage.setupHistory().withTask(['example.webp'])
+      await ws.trigger({
+        type: 'status',
+        data: {
+          status: { exec_info: { queue_remaining: 0 } }
+        }
+      })
+      await comfyPage.menu.queueTab.waitForTasks()
+
+      // The index of all tasks increments when a new task is prepended
+      const expectIndex = initialIndex + 1
+      expect(comfyPage.menu.queueTab.getGalleryImage(expectIndex)).toBeVisible()
+    })
+
+    test.describe('Gallery navigation', () => {
+      const paths: {
+        description: string
+        path: ('Right' | 'Left')[]
+        expectIndex: number
+      }[] = [
+        { description: 'Right', path: ['Right'], expectIndex: 1 },
+        { description: 'Left', path: ['Right', 'Left'], expectIndex: 0 },
+        { description: 'Right wrap', path: ['Right', 'Right'], expectIndex: 0 },
+        { description: 'Left wrap', path: ['Left'], expectIndex: 1 }
+      ]
+
+      paths.forEach(({ description, path, expectIndex }) => {
+        test(`can navigate gallery ${description}`, async ({ comfyPage }) => {
+          await comfyPage.menu.queueTab.openTaskPreview(0)
+          for (const direction of path)
+            await comfyPage.page.keyboard.press(`Arrow${direction}`)
+
+          expect(
+            comfyPage.menu.queueTab.getGalleryImage(expectIndex)
+          ).toBeVisible()
+        })
+      })
+    })
+  })
 })
diff --git a/src/components/sidebar/tabs/QueueSidebarTab.vue b/src/components/sidebar/tabs/QueueSidebarTab.vue
index b7741a5251..c1eebe9cac 100644
--- a/src/components/sidebar/tabs/QueueSidebarTab.vue
+++ b/src/components/sidebar/tabs/QueueSidebarTab.vue
@@ -99,7 +99,7 @@ import type { MenuItem } from 'primevue/menuitem'
 import ProgressSpinner from 'primevue/progressspinner'
 import { useConfirm } from 'primevue/useconfirm'
 import { useToast } from 'primevue/usetoast'
-import { computed, onMounted, onUnmounted, ref } from 'vue'
+import { computed, onMounted, onUnmounted, ref, shallowRef, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import NoResultsPlaceholder from '@/components/common/NoResultsPlaceholder.vue'
@@ -108,7 +108,11 @@ import { api } from '@/scripts/api'
 import { app } from '@/scripts/app'
 import { useLitegraphService } from '@/services/litegraphService'
 import { useCommandStore } from '@/stores/commandStore'
-import { TaskItemImpl, useQueueStore } from '@/stores/queueStore'
+import {
+  ResultItemImpl,
+  TaskItemImpl,
+  useQueueStore
+} from '@/stores/queueStore'
 import { useSettingStore } from '@/stores/settingStore'
 import { ComfyNode } from '@/types/comfyWorkflow'
 
@@ -127,6 +131,7 @@ const { t } = useI18n()
 // Expanded view: show all outputs in a flat list.
 const isExpanded = ref(false)
 const galleryActiveIndex = ref(-1)
+const allGalleryItems = shallowRef<ResultItemImpl[]>([])
 // Folder view: only show outputs from a single selected task.
 const folderTask = ref<TaskItemImpl | null>(null)
 const isInFolderView = computed(() => folderTask.value !== null)
@@ -141,12 +146,12 @@ const allTasks = computed(() =>
       ? queueStore.flatTasks
       : queueStore.tasks
 )
-const allGalleryItems = computed(() =>
-  allTasks.value.flatMap((task: TaskItemImpl) => {
+const updateGalleryItems = () => {
+  allGalleryItems.value = allTasks.value.flatMap((task: TaskItemImpl) => {
     const previewOutput = task.previewOutput
     return previewOutput ? [previewOutput] : []
   })
-)
+}
 
 const toggleExpanded = () => {
   isExpanded.value = !isExpanded.value
@@ -232,6 +237,7 @@ const handleContextMenu = ({
 }
 
 const handlePreview = (task: TaskItemImpl) => {
+  updateGalleryItems()
   galleryActiveIndex.value = allGalleryItems.value.findIndex(
     (item) => item.url === task.previewOutput?.url
   )
@@ -249,6 +255,19 @@ const toggleImageFit = () => {
   settingStore.set(IMAGE_FIT, imageFit.value === 'cover' ? 'contain' : 'cover')
 }
 
+watch(allTasks, () => {
+  const isGalleryOpen = galleryActiveIndex.value !== -1
+  if (!isGalleryOpen) return
+
+  const prevLength = allGalleryItems.value.length
+  updateGalleryItems()
+  const lengthChange = allGalleryItems.value.length - prevLength
+  if (!lengthChange) return
+
+  const newIndex = galleryActiveIndex.value + lengthChange
+  galleryActiveIndex.value = Math.max(0, newIndex)
+})
+
 onMounted(() => {
   api.addEventListener('status', onStatus)
   queueStore.update()