diff --git a/packages/electron-chrome-extensions/spec/crx-helpers.ts b/packages/electron-chrome-extensions/spec/crx-helpers.ts
index 05e46c1..80f9c65 100644
--- a/packages/electron-chrome-extensions/spec/crx-helpers.ts
+++ b/packages/electron-chrome-extensions/spec/crx-helpers.ts
@@ -14,12 +14,17 @@ export const createCrxSession = () => {
 }
 
 export const addCrxPreload = (session: Electron.Session) => {
-  // TODO(mv3): remove any
-  (session as any).registerPreloadScript({
-    id: 'crx-test-preload',
-    type: 'frame',
-    filePath: path.join(__dirname, 'fixtures', 'crx-test-preload.js')
-  })
+  const preloadPath = path.join(__dirname, 'fixtures', 'crx-test-preload.js')
+  if ('registerPreloadScript' in session) {
+    // TODO(mv3): remove any
+    ;(session as any).registerPreloadScript({
+      id: 'crx-test-preload',
+      type: 'frame',
+      filePath: preloadPath,
+    })
+  } else {
+    session.setPreloads([...session.getPreloads(), preloadPath])
+  }
 }
 
 export const createCrxRemoteWindow = () => {
diff --git a/packages/electron-chrome-extensions/src/browser-action.ts b/packages/electron-chrome-extensions/src/browser-action.ts
index 935841a..1ccd8ec 100644
--- a/packages/electron-chrome-extensions/src/browser-action.ts
+++ b/packages/electron-chrome-extensions/src/browser-action.ts
@@ -405,9 +405,14 @@ export const injectBrowserAction = () => {
     contextBridge.exposeInMainWorld('browserAction', __browserAction__)
 
     // Must execute script in main world to modify custom component registry.
-    ;(contextBridge as any).executeInMainWorld({
-      func: mainWorldScript,
-    })
+    if ('executeInMainWorld' in contextBridge) {
+      ;(contextBridge as any).executeInMainWorld({
+        func: mainWorldScript,
+      })
+    } else {
+      // TODO(mv3): remove webFrame usage
+      webFrame.executeJavaScript(`(${mainWorldScript}());`)
+    }
   } else {
     // When contextIsolation is disabled, contextBridge will throw an error.
     // If that's the case, we're in the main world so we can just execute our
diff --git a/packages/electron-chrome-extensions/src/browser/index.ts b/packages/electron-chrome-extensions/src/browser/index.ts
index 8653c76..d4403a9 100644
--- a/packages/electron-chrome-extensions/src/browser/index.ts
+++ b/packages/electron-chrome-extensions/src/browser/index.ts
@@ -104,18 +104,23 @@ export class ElectronChromeExtensions extends EventEmitter {
   private async prependPreload() {
     const { session } = this.ctx
 
-    // TODO(mv3): remove 'any'
     const preloadPath = path.join(this.modulePath, 'dist/preload.js')
-    ;(session as any).registerPreloadScript({
-      id: 'crx-mv2-preload',
-      type: 'frame',
-      filePath: preloadPath,
-    })
-    ;(session as any).registerPreloadScript({
-      id: 'crx-mv3-preload',
-      type: 'service-worker',
-      filePath: preloadPath,
-    })
+
+    if ('registerPreloadScript' in session) {
+      // TODO(mv3): remove 'any'
+      ;(session as any).registerPreloadScript({
+        id: 'crx-mv2-preload',
+        type: 'frame',
+        filePath: preloadPath,
+      })
+      ;(session as any).registerPreloadScript({
+        id: 'crx-mv3-preload',
+        type: 'service-worker',
+        filePath: preloadPath,
+      })
+    } else {
+      session.setPreloads([...session.getPreloads(), preloadPath])
+    }
 
     let preloadExists = false
     try {
diff --git a/packages/electron-chrome-extensions/src/preload.ts b/packages/electron-chrome-extensions/src/preload.ts
index be8d549..c80d601 100644
--- a/packages/electron-chrome-extensions/src/preload.ts
+++ b/packages/electron-chrome-extensions/src/preload.ts
@@ -1,6 +1,7 @@
 import { injectExtensionAPIs } from './renderer'
 
 // Only load within extension page context
+// TODO(mv3): remove any
 if ((process as any).type === 'service-worker' || location.href.startsWith('chrome-extension://')) {
   injectExtensionAPIs()
 }
diff --git a/packages/electron-chrome-extensions/src/renderer/index.ts b/packages/electron-chrome-extensions/src/renderer/index.ts
index d406a86..fdd3c39 100644
--- a/packages/electron-chrome-extensions/src/renderer/index.ts
+++ b/packages/electron-chrome-extensions/src/renderer/index.ts
@@ -545,9 +545,14 @@ export const injectExtensionAPIs = () => {
     contextBridge.exposeInMainWorld('electron', electronContext)
 
     // Mutate global 'chrome' object with additional APIs in the main world.
-    ;(contextBridge as any).executeInMainWorld({
-      func: mainWorldScript,
-    })
+    if ('executeInMainWorld' in contextBridge) {
+      ;(contextBridge as any).executeInMainWorld({
+        func: mainWorldScript,
+      })
+    } else {
+      // TODO(mv3): remove webFrame usage
+      webFrame.executeJavaScript(`(${mainWorldScript}());`)
+    }
   } catch (error) {
     console.error(`injectExtensionAPIs error (${location.href})`)
     console.error(error)
diff --git a/packages/electron-chrome-web-store/src/browser/index.ts b/packages/electron-chrome-web-store/src/browser/index.ts
index e31d233..8db5be3 100644
--- a/packages/electron-chrome-web-store/src/browser/index.ts
+++ b/packages/electron-chrome-web-store/src/browser/index.ts
@@ -525,7 +525,17 @@ export function installChromeWebStore(opts: ElectronChromeWebStoreOptions = {})
 
   // Add preload script to session
   const preloadPath = path.join(modulePath, 'dist/renderer/web-store-preload.js')
-  session.setPreloads([...session.getPreloads(), preloadPath])
+
+  if ('registerPreloadScript' in session) {
+    ;(session as any).registerPreloadScript({
+      id: 'electron-chrome-web-store',
+      type: 'frame',
+      filePath: preloadPath,
+    })
+  } else {
+    // TODO(mv3): remove
+    session.setPreloads([...session.getPreloads(), preloadPath])
+  }
 
   addIpcListeners(webStoreState)
 
diff --git a/packages/shell/browser/main.js b/packages/shell/browser/main.js
index 14bc5eb..173e6ab 100644
--- a/packages/shell/browser/main.js
+++ b/packages/shell/browser/main.js
@@ -126,11 +126,16 @@ class Browser {
     this.initSession()
     setupMenu(this)
 
-    this.session.registerPreloadScript({
-      id: 'shell-preload',
-      type: 'frame',
-      filePath: PATHS.PRELOAD,
-    })
+    if ('registerPreloadScript' in this.session) {
+      this.session.registerPreloadScript({
+        id: 'shell-preload',
+        type: 'frame',
+        filePath: PATHS.PRELOAD,
+      })
+    } else {
+      // TODO(mv3): remove
+      this.session.setPreloads([PATHS.PRELOAD])
+    }
 
     this.extensions = new ElectronChromeExtensions({
       license: 'internal-license-do-not-use',