diff --git a/services/web/app/src/infrastructure/ExpressLocals.js b/services/web/app/src/infrastructure/ExpressLocals.js
index 5f14977d3a..cca9c4352f 100644
--- a/services/web/app/src/infrastructure/ExpressLocals.js
+++ b/services/web/app/src/infrastructure/ExpressLocals.js
@@ -18,10 +18,6 @@ const {
 const {
   addOptionalCleanupHandlerAfterDrainingConnections,
 } = require('./GracefulShutdown')
-const { expressify } = require('@overleaf/promise-utils')
-const {
-  loadAssignmentsInLocals,
-} = require('../Features/SplitTests/SplitTestMiddleware')
 
 const IEEE_BRAND_ID = Settings.ieeeBrandId
 
@@ -75,10 +71,6 @@ function getWebpackAssets(entrypoint, section) {
 }
 
 module.exports = function (webRouter, privateApiRouter, publicApiRouter) {
-  webRouter.use(
-    expressify(loadAssignmentsInLocals(['remove-window-attributes']))
-  )
-
   if (process.env.NODE_ENV === 'development') {
     // In the dev-env, delay requests until we fetched the manifest once.
     webRouter.use(function (req, res, next) {
diff --git a/services/web/frontend/js/utils/meta.ts b/services/web/frontend/js/utils/meta.ts
index 71719bcaee..b5552b6405 100644
--- a/services/web/frontend/js/utils/meta.ts
+++ b/services/web/frontend/js/utils/meta.ts
@@ -46,8 +46,6 @@ import { PasswordStrengthOptions } from '../../../types/password-strength-option
 import { Subscription as ProjectDashboardSubscription } from '../../../types/project/dashboard/subscription'
 import { ThirdPartyIds } from '../../../types/third-party-ids'
 import { Publisher } from '../../../types/subscription/dashboard/publisher'
-import _ from 'lodash'
-import { isSplitTestEnabled } from '@/utils/splitTestUtils'
 
 export interface Meta {
   'ol-ExposedSettings': ExposedSettings
@@ -248,29 +246,3 @@ export default function getMeta<T extends keyof Meta>(name: T): Meta[T] {
   window.metaAttributesCache.set(name, value)
   return value
 }
-
-function convertMetaToWindowAttributes() {
-  Array.from(document.querySelectorAll('meta[name^="ol-"]'))
-    .map(element => (element as HTMLMetaElement).name)
-    // process short labels before long ones:
-    // e.g. assign 'foo' before 'foo.bar'
-    .sort()
-    .forEach(nameWithNamespace => {
-      const label = nameWithNamespace.slice('ol-'.length)
-      // @ts-ignore
-      _.set(window, label, getMeta(nameWithNamespace))
-    })
-}
-
-// Deduplicate warning, the bootstrap-3 bundle ships its own copy of this module.
-if (!window.warnedAboutWindowAttributeRemoval) {
-  window.warnedAboutWindowAttributeRemoval = true
-  // Notify any extension developers about the upcoming removal of window attributes.
-  // eslint-disable-next-line no-console
-  console.warn(
-    'overleaf.com: We are sunsetting window properties like "window.project_id". If you need access to any of these, please reach out to support@overleaf.com to discuss options.'
-  )
-}
-if (!isSplitTestEnabled('remove-window-attributes')) {
-  convertMetaToWindowAttributes()
-}
diff --git a/services/web/types/window.ts b/services/web/types/window.ts
index 730b3cdb28..84213774d6 100644
--- a/services/web/types/window.ts
+++ b/services/web/types/window.ts
@@ -5,7 +5,6 @@ declare global {
   // eslint-disable-next-line no-unused-vars
   interface Window {
     metaAttributesCache: Map<string, any>
-    warnedAboutWindowAttributeRemoval?: boolean
     _ide: Record<string, unknown> & {
       $scope: Record<string, unknown> & {
         pdf?: {