diff --git a/packages/puppeteer-core/src/node/BrowserRunner.ts b/packages/puppeteer-core/src/node/BrowserRunner.ts
index 656b2842..8c1b1268 100644
--- a/packages/puppeteer-core/src/node/BrowserRunner.ts
+++ b/packages/puppeteer-core/src/node/BrowserRunner.ts
@@ -20,7 +20,7 @@ import * as path from 'path';
 import * as readline from 'readline';
 import removeFolder from 'rimraf';
 import {promisify} from 'util';
-import {Connection as BiDiConnection} from '../common/bidi/Connection.js';
+import type {Connection as BiDiConnection} from '../common/bidi/bidi.js';
 import {Connection} from '../common/Connection.js';
 import {debug} from '../common/Debug.js';
 import {TimeoutError} from '../common/Errors.js';
@@ -262,7 +262,8 @@ export class BrowserRunner {
     );
     browserWSEndpoint += '/session';
     const transport = await WebSocketTransport.create(browserWSEndpoint);
-    return new BiDiConnection(transport, slowMo);
+    const BiDi = await import('../common/bidi/bidi.js');
+    return new BiDi.Connection(transport, slowMo);
   }
 
   async setupConnection(options: {
diff --git a/packages/puppeteer-core/src/node/FirefoxLauncher.ts b/packages/puppeteer-core/src/node/FirefoxLauncher.ts
index c40b77c4..f2123359 100644
--- a/packages/puppeteer-core/src/node/FirefoxLauncher.ts
+++ b/packages/puppeteer-core/src/node/FirefoxLauncher.ts
@@ -2,7 +2,6 @@ import fs from 'fs';
 import os from 'os';
 import path from 'path';
 import {Browser} from '../api/Browser.js';
-import {Browser as BiDiBrowser} from '../common/bidi/Browser.js';
 import {CDPBrowser} from '../common/Browser.js';
 import {assert} from '../util/assert.js';
 import {BrowserFetcher} from './BrowserFetcher.js';
@@ -133,7 +132,8 @@ export class FirefoxLauncher extends ProductLauncher {
           slowMo,
           preferredRevision: this.puppeteer.browserRevision,
         });
-        browser = await BiDiBrowser.create({
+        const BiDi = await import('../common/bidi/bidi.js');
+        browser = await BiDi.Browser.create({
           connection,
           closeCallback: runner.close.bind(runner),
           process: runner.proc,