diff --git a/browser_tests/ComfyPage.ts b/browser_tests/ComfyPage.ts
index 673319003..593aef8e5 100644
--- a/browser_tests/ComfyPage.ts
+++ b/browser_tests/ComfyPage.ts
@@ -38,9 +38,11 @@ class ComfyNodeSearchBox {
 }
 
 class ComfyMenu {
+  public readonly sideToolBar: Locator
   public readonly themeToggleButton: Locator
 
   constructor(public readonly page: Page) {
+    this.sideToolBar = page.locator('.side-tool-bar-container')
     this.themeToggleButton = page.locator('.comfy-vue-theme-toggle')
   }
 
diff --git a/browser_tests/menu.spec.ts b/browser_tests/menu.spec.ts
index 1c74a8e98..369cc27c4 100644
--- a/browser_tests/menu.spec.ts
+++ b/browser_tests/menu.spec.ts
@@ -42,4 +42,29 @@ test.describe('Menu', () => {
 
     expect(await comfyPage.menu.getThemeId()).toBe('dark')
   })
+
+  test('Can register sidebar tab', async ({ comfyPage }) => {
+    const initialChildrenCount = await comfyPage.menu.sideToolBar.evaluate(
+      (el) => el.children.length
+    )
+
+    await comfyPage.page.evaluate(async () => {
+      window['app'].extensionManager.registerSidebarTab({
+        id: 'search',
+        icon: 'pi pi-search',
+        title: 'search',
+        tooltip: 'search',
+        type: 'custom',
+        render: (el) => {
+          el.innerHTML = '<div>Custom search tab</div>'
+        }
+      })
+    })
+    await comfyPage.nextFrame()
+
+    const newChildrenCount = await comfyPage.menu.sideToolBar.evaluate(
+      (el) => el.children.length
+    )
+    expect(newChildrenCount).toBe(initialChildrenCount + 1)
+  })
 })
diff --git a/src/App.vue b/src/App.vue
index 3ede732a2..691dbdfc1 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -21,8 +21,8 @@ import QueueSideBarTab from '@/components/sidebar/tabs/QueueSideBarTab.vue'
 import ProgressSpinner from 'primevue/progressspinner'
 import { app } from './scripts/app'
 import { useSettingStore } from './stores/settingStore'
-import { ExtensionManagerImpl } from './scripts/extensionManager'
 import { useI18n } from 'vue-i18n'
+import { useWorkspaceStore } from './stores/workspaceStateStore'
 
 const isLoading = ref(true)
 const nodeSearchEnabled = computed<boolean>(
@@ -52,8 +52,7 @@ const { t } = useI18n()
 const init = () => {
   useSettingStore().addSettings(app.ui.settings)
   app.vueAppReady = true
-  // lazy init as extension manager needs to access pinia store.
-  app.extensionManager = new ExtensionManagerImpl()
+  app.extensionManager = useWorkspaceStore()
   app.extensionManager.registerSidebarTab({
     id: 'queue',
     icon: 'pi pi-history',
diff --git a/src/components/sidebar/SideToolBar.vue b/src/components/sidebar/SideToolBar.vue
index a338d8491..caaebda82 100644
--- a/src/components/sidebar/SideToolBar.vue
+++ b/src/components/sidebar/SideToolBar.vue
@@ -39,25 +39,24 @@ import SideBarIcon from './SideBarIcon.vue'
 import SideBarThemeToggleIcon from './SideBarThemeToggleIcon.vue'
 import SideBarSettingsToggleIcon from './SideBarSettingsToggleIcon.vue'
 import { computed, onBeforeUnmount } from 'vue'
-import { app } from '@/scripts/app'
 import { useWorkspaceStore } from '@/stores/workspaceStateStore'
 import {
   CustomSidebarTabExtension,
   SidebarTabExtension
 } from '@/types/extensionTypes'
 
-const workspaceStateStore = useWorkspaceStore()
-const tabs = computed(() => app.extensionManager.getSidebarTabs())
+const workspaceStore = useWorkspaceStore()
+const tabs = computed(() => workspaceStore.getSidebarTabs())
 const selectedTab = computed<SidebarTabExtension | null>(() => {
-  const tabId = workspaceStateStore.activeSidebarTab
+  const tabId = workspaceStore.activeSidebarTab
   return tabs.value.find((tab) => tab.id === tabId) || null
 })
 const mountCustomTab = (tab: CustomSidebarTabExtension, el: HTMLElement) => {
   tab.render(el)
 }
 const onTabClick = (item: SidebarTabExtension) => {
-  workspaceStateStore.updateActiveSidebarTab(
-    workspaceStateStore.activeSidebarTab === item.id ? null : item.id
+  workspaceStore.updateActiveSidebarTab(
+    workspaceStore.activeSidebarTab === item.id ? null : item.id
   )
 }
 onBeforeUnmount(() => {
diff --git a/src/scripts/extensionManager.ts b/src/scripts/extensionManager.ts
deleted file mode 100644
index d64e3ca2b..000000000
--- a/src/scripts/extensionManager.ts
+++ /dev/null
@@ -1,43 +0,0 @@
-import { useWorkspaceStore } from '@/stores/workspaceStateStore'
-import { ExtensionManager, SidebarTabExtension } from '@/types/extensionTypes'
-
-export class ExtensionManagerImpl implements ExtensionManager {
-  private sidebarTabs: SidebarTabExtension[] = []
-  private workspaceStore = useWorkspaceStore()
-
-  registerSidebarTab(tab: SidebarTabExtension) {
-    this.sidebarTabs.push(tab)
-    this.updateSidebarOrder()
-  }
-
-  unregisterSidebarTab(id: string) {
-    const index = this.sidebarTabs.findIndex((tab) => tab.id === id)
-    if (index !== -1) {
-      const tab = this.sidebarTabs[index]
-      if (tab.type === 'custom' && tab.destroy) {
-        tab.destroy()
-      }
-      this.sidebarTabs.splice(index, 1)
-      this.updateSidebarOrder()
-    }
-  }
-
-  getSidebarTabs() {
-    return this.sidebarTabs.sort((a, b) => {
-      const orderA = this.workspaceStore.sidebarTabsOrder.indexOf(a.id)
-      const orderB = this.workspaceStore.sidebarTabsOrder.indexOf(b.id)
-      return orderA - orderB
-    })
-  }
-
-  private updateSidebarOrder() {
-    const currentOrder = this.workspaceStore.sidebarTabsOrder
-    const newTabs = this.sidebarTabs.filter(
-      (tab) => !currentOrder.includes(tab.id)
-    )
-    this.workspaceStore.updateSidebarOrder([
-      ...currentOrder,
-      ...newTabs.map((tab) => tab.id)
-    ])
-  }
-}
diff --git a/src/stores/workspaceStateStore.ts b/src/stores/workspaceStateStore.ts
index 8ff2a6af5..b8f75928b 100644
--- a/src/stores/workspaceStateStore.ts
+++ b/src/stores/workspaceStateStore.ts
@@ -1,32 +1,37 @@
+import { SidebarTabExtension } from '@/types/extensionTypes'
 import { defineStore } from 'pinia'
 
 interface WorkspaceState {
   activeSidebarTab: string | null
-  sidebarTabsOrder: string[] // Array of tab IDs in order
+  sidebarTabs: SidebarTabExtension[]
 }
 
 export const useWorkspaceStore = defineStore('workspace', {
   state: (): WorkspaceState => ({
     activeSidebarTab: null,
-    sidebarTabsOrder: []
+    sidebarTabs: []
   }),
   actions: {
     updateActiveSidebarTab(tabId: string) {
       this.activeSidebarTab = tabId
     },
-    updateSidebarOrder(newOrder: string[]) {
-      this.sidebarTabsOrder = newOrder
+    registerSidebarTab(tab: SidebarTabExtension) {
+      this.sidebarTabs = [...this.sidebarTabs, tab]
     },
-    serialize() {
-      return JSON.stringify({
-        activeSidebarTab: this.activeSidebarTab,
-        sidebarTabsOrder: this.sidebarTabsOrder
-      })
+    unregisterSidebarTab(id: string) {
+      const index = this.sidebarTabs.findIndex((tab) => tab.id === id)
+      if (index !== -1) {
+        const tab = this.sidebarTabs[index]
+        if (tab.type === 'custom' && tab.destroy) {
+          tab.destroy()
+        }
+        const newSidebarTabs = [...this.sidebarTabs]
+        newSidebarTabs.splice(index, 1)
+        this.sidebarTabs = newSidebarTabs
+      }
     },
-    deserialize(state: string) {
-      const parsedState = JSON.parse(state)
-      this.sidebarTabsOrder = parsedState.sidebarTabsOrder
-      this.activeSidebarTab = parsedState.activeSidebarTab
+    getSidebarTabs() {
+      return [...this.sidebarTabs]
     }
   }
 })