diff --git a/browser_tests/fixtures/ComfyPage.ts b/browser_tests/fixtures/ComfyPage.ts
index 2d9028a35..b817b14f8 100644
--- a/browser_tests/fixtures/ComfyPage.ts
+++ b/browser_tests/fixtures/ComfyPage.ts
@@ -34,6 +34,7 @@ import { SubgraphHelper } from './helpers/SubgraphHelper'
 import { ToastHelper } from './helpers/ToastHelper'
 import { WorkflowHelper } from './helpers/WorkflowHelper'
 import type { NodeReference } from './utils/litegraphUtils'
+import type { WorkspaceStore } from '../types/globals'
 
 dotenv.config()
 
@@ -139,7 +140,9 @@ class ConfirmDialog {
 
     // Wait for workflow service to finish if it's busy
     await this.page.waitForFunction(
-      () => window.app?.extensionManager?.workflow?.isBusy === false,
+      () =>
+        (window.app?.extensionManager as WorkspaceStore | undefined)?.workflow
+          ?.isBusy === false,
       undefined,
       { timeout: 3000 }
     )
@@ -387,7 +390,7 @@ export class ComfyPage {
 
   async setFocusMode(focusMode: boolean) {
     await this.page.evaluate((focusMode) => {
-      window.app!.extensionManager.focusMode = focusMode
+      ;(window.app!.extensionManager as WorkspaceStore).focusMode = focusMode
     }, focusMode)
     await this.nextFrame()
   }
diff --git a/browser_tests/fixtures/components/SidebarTab.ts b/browser_tests/fixtures/components/SidebarTab.ts
index 0c64f0fe0..20706bcba 100644
--- a/browser_tests/fixtures/components/SidebarTab.ts
+++ b/browser_tests/fixtures/components/SidebarTab.ts
@@ -1,5 +1,6 @@
 import type { Locator, Page } from '@playwright/test'
 
+import type { WorkspaceStore } from '../../types/globals'
 import { TestIds } from '../selectors'
 
 class SidebarTab {
@@ -154,7 +155,9 @@ export class WorkflowsSidebarTab extends SidebarTab {
 
     // Wait for workflow service to finish renaming
     await this.page.waitForFunction(
-      () => !window.app?.extensionManager?.workflow?.isBusy,
+      () =>
+        !(window.app?.extensionManager as WorkspaceStore | undefined)?.workflow
+          ?.isBusy,
       undefined,
       { timeout: 3000 }
     )
diff --git a/browser_tests/fixtures/components/Topbar.ts b/browser_tests/fixtures/components/Topbar.ts
index e53bf4264..e91311c7b 100644
--- a/browser_tests/fixtures/components/Topbar.ts
+++ b/browser_tests/fixtures/components/Topbar.ts
@@ -1,5 +1,7 @@
 import type { Locator, Page } from '@playwright/test'
 
+import type { WorkspaceStore } from '../../types/globals'
+
 export class Topbar {
   private readonly menuLocator: Locator
   private readonly menuTrigger: Locator
@@ -85,7 +87,7 @@ export class Topbar {
 
     // Wait for workflow service to finish saving
     await this.page.waitForFunction(
-      () => !window.app!.extensionManager.workflow.isBusy,
+      () => !(window.app!.extensionManager as WorkspaceStore).workflow.isBusy,
       undefined,
       { timeout: 3000 }
     )
diff --git a/browser_tests/fixtures/helpers/WorkflowHelper.ts b/browser_tests/fixtures/helpers/WorkflowHelper.ts
index 61ea974e8..7f08aeb94 100644
--- a/browser_tests/fixtures/helpers/WorkflowHelper.ts
+++ b/browser_tests/fixtures/helpers/WorkflowHelper.ts
@@ -1,10 +1,8 @@
 import { readFileSync } from 'fs'
 
-import type { useWorkspaceStore } from '../../../src/stores/workspaceStore'
+import type { WorkspaceStore } from '../../types/globals'
 import type { ComfyPage } from '../ComfyPage'
 
-type WorkspaceStore = ReturnType<typeof useWorkspaceStore>
-
 export type FolderStructure = {
   [key: string]: FolderStructure | string
 }
@@ -45,7 +43,9 @@ export class WorkflowHelper {
     }
 
     await this.comfyPage.page.evaluate(async () => {
-      await window.app!.extensionManager.workflow.syncWorkflows()
+      await (
+        window.app!.extensionManager as WorkspaceStore
+      ).workflow.syncWorkflows()
     })
 
     // Wait for Vue to re-render the workflow list
diff --git a/browser_tests/helpers/actionbar.ts b/browser_tests/helpers/actionbar.ts
index be128ba90..196905b84 100644
--- a/browser_tests/helpers/actionbar.ts
+++ b/browser_tests/helpers/actionbar.ts
@@ -1,6 +1,7 @@
 import type { Locator, Page } from '@playwright/test'
 
 import type { AutoQueueMode } from '../../src/stores/queueStore'
+import type { WorkspaceStore } from '../types/globals'
 
 export class ComfyActionbar {
   public readonly root: Locator
@@ -42,13 +43,14 @@ class ComfyQueueButtonOptions {
 
   public async setMode(mode: AutoQueueMode) {
     await this.page.evaluate((mode) => {
-      window.app!.extensionManager.queueSettings.mode = mode
+      ;(window.app!.extensionManager as WorkspaceStore).queueSettings.mode =
+        mode
     }, mode)
   }
 
   public async getMode() {
     return await this.page.evaluate(() => {
-      return window.app!.extensionManager.queueSettings.mode
+      return (window.app!.extensionManager as WorkspaceStore).queueSettings.mode
     })
   }
 }
diff --git a/browser_tests/tests/actionbar.spec.ts b/browser_tests/tests/actionbar.spec.ts
index dbbf08ce4..4d57b65f4 100644
--- a/browser_tests/tests/actionbar.spec.ts
+++ b/browser_tests/tests/actionbar.spec.ts
@@ -4,6 +4,7 @@ import { expect, mergeTests } from '@playwright/test'
 import type { StatusWsMessage } from '../../src/schemas/apiSchema'
 import { comfyPageFixture } from '../fixtures/ComfyPage'
 import { webSocketFixture } from '../fixtures/ws'
+import type { WorkspaceStore } from '../types/globals'
 
 const test = mergeTests(comfyPageFixture, webSocketFixture)
 
@@ -54,7 +55,9 @@ test.describe('Actionbar', { tag: '@ui' }, () => {
         )
         node!.widgets![0].value = value
 
-        window.app!.extensionManager.workflow.activeWorkflow?.changeTracker.checkState()
+        ;(
+          window.app!.extensionManager as WorkspaceStore
+        ).workflow.activeWorkflow?.changeTracker.checkState()
       }, value)
     }
 
diff --git a/browser_tests/tests/browserTabTitle.spec.ts b/browser_tests/tests/browserTabTitle.spec.ts
index af75555f0..e70afcd6c 100644
--- a/browser_tests/tests/browserTabTitle.spec.ts
+++ b/browser_tests/tests/browserTabTitle.spec.ts
@@ -2,6 +2,7 @@ import { expect } from '@playwright/test'
 
 import { comfyPageFixture as test } from '../fixtures/ComfyPage'
 import { DefaultGraphPositions } from '../fixtures/constants/defaultGraphPositions'
+import type { WorkspaceStore } from '../types/globals'
 
 test.describe('Browser tab title', { tag: '@smoke' }, () => {
   test.describe('Beta Menu', () => {
@@ -11,7 +12,8 @@ test.describe('Browser tab title', { tag: '@smoke' }, () => {
 
     test('Can display workflow name', async ({ comfyPage }) => {
       const workflowName = await comfyPage.page.evaluate(async () => {
-        return window.app!.extensionManager.workflow.activeWorkflow?.filename
+        return (window.app!.extensionManager as WorkspaceStore).workflow
+          .activeWorkflow?.filename
       })
       expect(await comfyPage.page.title()).toBe(`*${workflowName} - ComfyUI`)
     })
@@ -22,7 +24,8 @@ test.describe('Browser tab title', { tag: '@smoke' }, () => {
       comfyPage
     }) => {
       const workflowName = await comfyPage.page.evaluate(async () => {
-        return window.app!.extensionManager.workflow.activeWorkflow?.filename
+        return (window.app!.extensionManager as WorkspaceStore).workflow
+          .activeWorkflow?.filename
       })
       expect(await comfyPage.page.title()).toBe(`${workflowName} - ComfyUI`)
 
@@ -38,7 +41,9 @@ test.describe('Browser tab title', { tag: '@smoke' }, () => {
 
       // Delete the saved workflow for cleanup.
       await comfyPage.page.evaluate(async () => {
-        return window.app!.extensionManager.workflow.activeWorkflow?.delete()
+        return (
+          window.app!.extensionManager as WorkspaceStore
+        ).workflow.activeWorkflow?.delete()
       })
     })
   })
diff --git a/browser_tests/tests/colorPalette.spec.ts b/browser_tests/tests/colorPalette.spec.ts
index 703bea722..de8a4282b 100644
--- a/browser_tests/tests/colorPalette.spec.ts
+++ b/browser_tests/tests/colorPalette.spec.ts
@@ -1,6 +1,7 @@
 import { expect } from '@playwright/test'
 
 import { comfyPageFixture as test } from '../fixtures/ComfyPage'
+import type { WorkspaceStore } from '../types/globals'
 
 test.beforeEach(async ({ comfyPage }) => {
   await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
@@ -178,7 +179,9 @@ test.describe('Color Palette', { tag: ['@screenshot', '@settings'] }, () => {
 
   test('Can add custom color palette', async ({ comfyPage }) => {
     await comfyPage.page.evaluate((p) => {
-      window.app!.extensionManager.colorPalette.addCustomColorPalette(p)
+      ;(
+        window.app!.extensionManager as WorkspaceStore
+      ).colorPalette.addCustomColorPalette(p)
     }, customColorPalettes.obsidian_dark)
     expect(await comfyPage.toast.getToastErrorCount()).toBe(0)
 
diff --git a/browser_tests/types.d.ts b/browser_tests/types.d.ts
deleted file mode 100644
index 4bdc398ae..000000000
--- a/browser_tests/types.d.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-/**
- * Type declarations for browser tests.
- * Augments global types with test-specific properties.
- */
-
-declare global {
-  interface Window {
-    /**
-     * WebSocket store used by test fixtures for mocking WebSocket connections.
-     * @see browser_tests/fixtures/ws.ts
-     */
-    __ws__?: Record<string, WebSocket>
-  }
-}
-
-export {}
diff --git a/browser_tests/types/globals.d.ts b/browser_tests/types/globals.d.ts
index bde4fb7e2..90e7493e7 100644
--- a/browser_tests/types/globals.d.ts
+++ b/browser_tests/types/globals.d.ts
@@ -1,6 +1,7 @@
-import type { ComfyApp } from '@/scripts/app'
 import type { LGraph } from '@/lib/litegraph/src/LGraph'
 import type { LiteGraphGlobal } from '@/lib/litegraph/src/LiteGraphGlobal'
+import type { ComfyApp } from '@/scripts/app'
+import type { useWorkspaceStore } from '@/stores/workspaceStore'
 
 interface AppReadiness {
   featureFlagsReceived: boolean
@@ -29,6 +30,12 @@ declare global {
     // Feature flags test globals
     __capturedMessages?: CapturedMessages
     __appReadiness?: AppReadiness
+
+    /**
+     * WebSocket store used by test fixtures for mocking WebSocket connections.
+     * @see browser_tests/fixtures/ws.ts
+     */
+    __ws__?: Record<string, WebSocket>
   }
 
   const app: ComfyApp | undefined
@@ -37,4 +44,15 @@ declare global {
   const LGraphBadge: typeof LGraphBadge | undefined
 }
 
-export {}
+/**
+ * Internal store type for browser test access.
+ * Used to access properties not exposed via the public ExtensionManager interface.
+ *
+ * @example
+ * ```ts
+ * await page.evaluate(() => {
+ *   ;(window.app!.extensionManager as WorkspaceStore).workflow.syncWorkflows()
+ * })
+ * ```
+ */
+export type WorkspaceStore = ReturnType<typeof useWorkspaceStore>
diff --git a/src/scripts/app.ts b/src/scripts/app.ts
index eddae324d..8d040488a 100644
--- a/src/scripts/app.ts
+++ b/src/scripts/app.ts
@@ -65,8 +65,9 @@ import { useModelStore } from '@/stores/modelStore'
 import { SYSTEM_NODE_DEFS, useNodeDefStore } from '@/stores/nodeDefStore'
 import { useSubgraphStore } from '@/stores/subgraphStore'
 import { useWidgetStore } from '@/stores/widgetStore'
-import { useWorkspaceStore, type WorkspaceStore } from '@/stores/workspaceStore'
+import { useWorkspaceStore } from '@/stores/workspaceStore'
 import type { ComfyExtension, MissingNodeType } from '@/types/comfy'
+import type { ExtensionManager } from '@/types/extensionTypes'
 import type { NodeExecutionId } from '@/types/nodeIdentification'
 import { graphToPrompt } from '@/utils/executionUtil'
 import { anyItemOverlapsRect } from '@/utils/mathUtil'
@@ -154,7 +155,7 @@ export class ComfyApp {
   vueAppReady: boolean
   api: ComfyApi
   ui: ComfyUI
-  extensionManager!: WorkspaceStore
+  extensionManager!: ExtensionManager
   private _nodeOutputs!: Record<string, NodeExecutionOutput>
   nodePreviewImages: Record<string, string[]>
 
diff --git a/src/stores/workspaceStore.ts b/src/stores/workspaceStore.ts
index 26cc0262f..ac6a044b9 100644
--- a/src/stores/workspaceStore.ts
+++ b/src/stores/workspaceStore.ts
@@ -111,5 +111,3 @@ const workspaceStoreSetup = () => {
 }
 
 export const useWorkspaceStore = defineStore('workspace', workspaceStoreSetup)
-
-export type WorkspaceStore = ReturnType<typeof useWorkspaceStore>