diff --git a/eslint.config.mjs b/eslint.config.mjs
index 6fa060cf78..b5486d8760 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -177,7 +177,7 @@ const noBooleanCompareRules = {
   '@typescript-eslint/no-unnecessary-boolean-literal-compare': 2,
 };
 
-const noRestrictedGlobalsRules = {
+const noWebGlobalsRules = {
   'no-restricted-globals': [
     'error',
     { 'name': 'window' },
@@ -186,6 +186,13 @@ const noRestrictedGlobalsRules = {
   ],
 };
 
+const noNodeGlobalsRules = {
+  'no-restricted-globals': [
+    'error',
+    { 'name': 'process' },
+  ],
+};
+
 const importOrderRules = {
   'import/order': [2, {
     'groups': ['builtin', 'external', 'internal', ['parent', 'sibling'], 'index', 'type'],
@@ -249,7 +256,19 @@ export default [{
   files: ['packages/playwright-core/src/server/injected/**/*.ts'],
   languageOptions: languageOptionsWithTsConfig,
   rules: {
-    ...noRestrictedGlobalsRules,
+    ...noWebGlobalsRules,
+    ...noFloatingPromisesRules,
+    ...noBooleanCompareRules,
+  }
+}, {
+  files: [
+    'packages/playwright-core/src/client/**/*.ts',
+    'packages/playwright-core/src/protocol/**/*.ts',
+    'packages/playwright-core/src/utils/**/*.ts',
+  ],
+  languageOptions: languageOptionsWithTsConfig,
+  rules: {
+    ...noNodeGlobalsRules,
     ...noFloatingPromisesRules,
     ...noBooleanCompareRules,
   }
diff --git a/packages/playwright-core/src/cli/program.ts b/packages/playwright-core/src/cli/program.ts
index 6c0ccd230c..4a9b4b9bb9 100644
--- a/packages/playwright-core/src/cli/program.ts
+++ b/packages/playwright-core/src/cli/program.ts
@@ -23,9 +23,9 @@ import * as path from 'path';
 import * as playwright from '../..';
 import { launchBrowserServer, printApiJson, runDriver, runServer } from './driver';
 import { registry, writeDockerVersion } from '../server';
-import { gracefullyProcessExitDoNotHang } from '../utils';
+import { gracefullyProcessExitDoNotHang, isLikelyNpxGlobal } from '../utils';
 import { runTraceInBrowser, runTraceViewerApp } from '../server/trace/viewer/traceViewer';
-import { assert, getPackageManagerExecCommand, isLikelyNpxGlobal } from '../utils';
+import { assert, getPackageManagerExecCommand } from '../utils';
 import { wrapInASCIIBox } from '../server/utils/ascii';
 import { dotenv, program } from '../utilsBundle';
 
diff --git a/packages/playwright-core/src/client/android.ts b/packages/playwright-core/src/client/android.ts
index 91cf3220ac..4b3ca152ee 100644
--- a/packages/playwright-core/src/client/android.ts
+++ b/packages/playwright-core/src/client/android.ts
@@ -51,7 +51,9 @@ export class Android extends ChannelOwner<channels.AndroidChannel> implements ap
 
   setDefaultTimeout(timeout: number) {
     this._timeoutSettings.setDefaultTimeout(timeout);
-    this._channel.setDefaultTimeoutNoReply({ timeout });
+    this._wrapApiCall(async () => {
+      await this._channel.setDefaultTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   async devices(options: { port?: number } = {}): Promise<AndroidDevice[]> {
@@ -133,7 +135,9 @@ export class AndroidDevice extends ChannelOwner<channels.AndroidDeviceChannel> i
 
   setDefaultTimeout(timeout: number) {
     this._timeoutSettings.setDefaultTimeout(timeout);
-    this._channel.setDefaultTimeoutNoReply({ timeout });
+    this._wrapApiCall(async () => {
+      await this._channel.setDefaultTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   serial(): string {
diff --git a/packages/playwright-core/src/client/browserContext.ts b/packages/playwright-core/src/client/browserContext.ts
index 5ed9262b02..445379083e 100644
--- a/packages/playwright-core/src/client/browserContext.ts
+++ b/packages/playwright-core/src/client/browserContext.ts
@@ -246,15 +246,15 @@ export class BrowserContext extends ChannelOwner<channels.BrowserContextChannel>
   setDefaultNavigationTimeout(timeout: number | undefined) {
     this._timeoutSettings.setDefaultNavigationTimeout(timeout);
     this._wrapApiCall(async () => {
-      this._channel.setDefaultNavigationTimeoutNoReply({ timeout }).catch(() => {});
-    }, true);
+      await this._channel.setDefaultNavigationTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   setDefaultTimeout(timeout: number | undefined) {
     this._timeoutSettings.setDefaultTimeout(timeout);
     this._wrapApiCall(async () => {
-      this._channel.setDefaultTimeoutNoReply({ timeout }).catch(() => {});
-    }, true);
+      await this._channel.setDefaultTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   browser(): Browser | null {
@@ -559,7 +559,7 @@ export async function prepareBrowserContextParams(platform: Platform, options: B
     };
   }
   if (contextParams.recordVideo && contextParams.recordVideo.dir)
-    contextParams.recordVideo.dir = platform.path().resolve(process.cwd(), contextParams.recordVideo.dir);
+    contextParams.recordVideo.dir = platform.path().resolve(contextParams.recordVideo.dir);
   return contextParams;
 }
 
diff --git a/packages/playwright-core/src/client/channelOwner.ts b/packages/playwright-core/src/client/channelOwner.ts
index e3b541ee9a..aaf8c6beb2 100644
--- a/packages/playwright-core/src/client/channelOwner.ts
+++ b/packages/playwright-core/src/client/channelOwner.ts
@@ -199,7 +199,7 @@ export abstract class ChannelOwner<T extends channels.Channel = channels.Channel
       }
       return result;
     } catch (e) {
-      const innerError = ((process.env.PWDEBUGIMPL || this._platform.isUnderTest()) && e.stack) ? '\n<inner error>\n' + e.stack : '';
+      const innerError = ((this._platform.showInternalStackFrames() || this._platform.isUnderTest()) && e.stack) ? '\n<inner error>\n' + e.stack : '';
       if (apiZone.apiName && !apiZone.apiName.includes('<anonymous>'))
         e.message = apiZone.apiName + ': ' + e.message;
       const stackFrames = '\n' + stringifyStackFrames(stackTrace.frames).join('\n') + innerError;
diff --git a/packages/playwright-core/src/client/clientStackTrace.ts b/packages/playwright-core/src/client/clientStackTrace.ts
index 8a18787517..3dc16dbae6 100644
--- a/packages/playwright-core/src/client/clientStackTrace.ts
+++ b/packages/playwright-core/src/client/clientStackTrace.ts
@@ -28,7 +28,7 @@ export function captureLibraryStackTrace(platform: Platform): { frames: StackFra
     isPlaywrightLibrary: boolean;
   };
   let parsedFrames = stack.map(line => {
-    const frame = parseStackFrame(line, platform.pathSeparator);
+    const frame = parseStackFrame(line, platform.pathSeparator, platform.showInternalStackFrames());
     if (!frame || !frame.file)
       return null;
     const isPlaywrightLibrary = !!platform.coreDir && frame.file.startsWith(platform.coreDir);
@@ -62,10 +62,8 @@ export function captureLibraryStackTrace(platform: Platform): { frames: StackFra
   }
 
   // This is for the inspector so that it did not include the test runner stack frames.
-  const filterPrefixes = platform.coreDir ? [platform.coreDir, ...platform.boxedStackPrefixes()] : platform.boxedStackPrefixes();
+  const filterPrefixes = platform.boxedStackPrefixes();
   parsedFrames = parsedFrames.filter(f => {
-    if (process.env.PWDEBUGIMPL)
-      return true;
     if (filterPrefixes.some(prefix => f.frame.file.startsWith(prefix)))
       return false;
     return true;
diff --git a/packages/playwright-core/src/client/electron.ts b/packages/playwright-core/src/client/electron.ts
index f721d89f07..3d9241321d 100644
--- a/packages/playwright-core/src/client/electron.ts
+++ b/packages/playwright-core/src/client/electron.ts
@@ -54,7 +54,7 @@ export class Electron extends ChannelOwner<channels.ElectronChannel> implements
   async launch(options: ElectronOptions = {}): Promise<ElectronApplication> {
     const params: channels.ElectronLaunchParams = {
       ...await prepareBrowserContextParams(this._platform, options),
-      env: envObjectToArray(options.env ? options.env : process.env),
+      env: envObjectToArray(options.env ? options.env : this._platform.env),
       tracesDir: options.tracesDir,
     };
     const app = ElectronApplication.from((await this._channel.launch(params)).electronApplication);
diff --git a/packages/playwright-core/src/client/page.ts b/packages/playwright-core/src/client/page.ts
index 0aa5aeb667..b91b0b53cd 100644
--- a/packages/playwright-core/src/client/page.ts
+++ b/packages/playwright-core/src/client/page.ts
@@ -277,15 +277,15 @@ export class Page extends ChannelOwner<channels.PageChannel> implements api.Page
   setDefaultNavigationTimeout(timeout: number) {
     this._timeoutSettings.setDefaultNavigationTimeout(timeout);
     this._wrapApiCall(async () => {
-      this._channel.setDefaultNavigationTimeoutNoReply({ timeout }).catch(() => {});
-    }, true);
+      await this._channel.setDefaultNavigationTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   setDefaultTimeout(timeout: number) {
     this._timeoutSettings.setDefaultTimeout(timeout);
     this._wrapApiCall(async () => {
-      this._channel.setDefaultTimeoutNoReply({ timeout }).catch(() => {});
-    }, true);
+      await this._channel.setDefaultTimeoutNoReply({ timeout });
+    }, true).catch(() => {});
   }
 
   private _forceVideo(): Video {
diff --git a/packages/playwright-core/src/client/platform.ts b/packages/playwright-core/src/client/platform.ts
index 31d6705378..e9d47c5692 100644
--- a/packages/playwright-core/src/client/platform.ts
+++ b/packages/playwright-core/src/client/platform.ts
@@ -45,6 +45,7 @@ export type Platform = {
   coreDir?: string;
   createGuid: () => string;
   defaultMaxListeners: () => number;
+  env: Record<string, string | undefined>;
   fs: () => typeof fs;
   inspectCustom: symbol | undefined;
   isDebugMode: () => boolean;
@@ -54,6 +55,7 @@ export type Platform = {
   log: (name: 'api' | 'channel', message: string | Error | object) => void;
   path: () => typeof path;
   pathSeparator: string;
+  showInternalStackFrames: () => boolean,
   streamFile: (path: string, writable: Writable) => Promise<void>,
   streamReadable: (channel: channels.StreamChannel) => Readable,
   streamWritable: (channel: channels.WritableStreamChannel) => Writable,
@@ -77,6 +79,8 @@ export const emptyPlatform: Platform = {
 
   defaultMaxListeners: () => 10,
 
+  env: {},
+
   fs: () => {
     throw new Error('Not implemented');
   },
@@ -101,6 +105,8 @@ export const emptyPlatform: Platform = {
 
   pathSeparator: '/',
 
+  showInternalStackFrames: () => false,
+
   streamFile(path: string, writable: Writable): Promise<void> {
     throw new Error('Streams are not available');
   },
diff --git a/packages/playwright-core/src/client/waiter.ts b/packages/playwright-core/src/client/waiter.ts
index 8c01193d7a..e106ebd2bb 100644
--- a/packages/playwright-core/src/client/waiter.ts
+++ b/packages/playwright-core/src/client/waiter.ts
@@ -96,8 +96,8 @@ export class Waiter {
   log(s: string) {
     this._logs.push(s);
     this._channelOwner._wrapApiCall(async () => {
-      await this._channelOwner._channel.waitForEventInfo({ info: { waitId: this._waitId, phase: 'log', message: s } }).catch(() => {});
-    }, true);
+      await this._channelOwner._channel.waitForEventInfo({ info: { waitId: this._waitId, phase: 'log', message: s } });
+    }, true).catch(() => {});
   }
 
   private _rejectOn(promise: Promise<any>, dispose?: () => void) {
diff --git a/packages/playwright-core/src/client/webSocket.ts b/packages/playwright-core/src/client/webSocket.ts
index b4d8003789..2d3541b4f6 100644
--- a/packages/playwright-core/src/client/webSocket.ts
+++ b/packages/playwright-core/src/client/webSocket.ts
@@ -39,7 +39,7 @@ export async function connectOverWebSocket(parentConnection: Connection, params:
       connection!.dispatch(message);
     } catch (e) {
       closeError = String(e);
-      transport.close();
+      transport.close().catch(() => {});
     }
   });
   return connection;
@@ -70,7 +70,7 @@ class JsonPipeTransport implements Transport {
   }
 
   async send(message: object) {
-    this._owner._wrapApiCall(async () => {
+    await this._owner._wrapApiCall(async () => {
       await this._pipe!.send({ message });
     }, /* isInternal */ true);
   }
diff --git a/packages/playwright-core/src/server/utils/env.ts b/packages/playwright-core/src/server/utils/env.ts
index 2a4dd0bfd4..500c180f56 100644
--- a/packages/playwright-core/src/server/utils/env.ts
+++ b/packages/playwright-core/src/server/utils/env.ts
@@ -47,3 +47,7 @@ export function getPackageManagerExecCommand() {
     return 'pnpm exec';
   return 'npx';
 }
+
+export function isLikelyNpxGlobal() {
+  return process.argv.length >= 2 && process.argv[1].includes('_npx');
+}
diff --git a/packages/playwright-core/src/server/utils/nodePlatform.ts b/packages/playwright-core/src/server/utils/nodePlatform.ts
index 4a36322036..395b903c51 100644
--- a/packages/playwright-core/src/server/utils/nodePlatform.ts
+++ b/packages/playwright-core/src/server/utils/nodePlatform.ts
@@ -61,10 +61,16 @@ export function setBoxedStackPrefixes(prefixes: string[]) {
   boxedStackPrefixes = prefixes;
 }
 
+const coreDir = path.dirname(require.resolve('../../../package.json'));
+
 export const nodePlatform: Platform = {
   name: 'node',
 
-  boxedStackPrefixes: () => boxedStackPrefixes,
+  boxedStackPrefixes: () => {
+    if (process.env.PWDEBUGIMPL)
+      return [];
+    return [coreDir, ...boxedStackPrefixes];
+  },
 
   calculateSha1: (text: string) => {
     const sha1 = crypto.createHash('sha1');
@@ -74,13 +80,15 @@ export const nodePlatform: Platform = {
 
   colors,
 
-  coreDir: path.dirname(require.resolve('../../../package.json')),
+  coreDir,
 
   createGuid: () => crypto.randomBytes(16).toString('hex'),
 
   defaultMaxListeners: () => EventEmitter.defaultMaxListeners,
   fs: () => fs,
 
+  env: process.env,
+
   inspectCustom: util.inspect.custom,
 
   isDebugMode: () => !!debugMode(),
@@ -101,6 +109,8 @@ export const nodePlatform: Platform = {
 
   pathSeparator: path.sep,
 
+  showInternalStackFrames: () => !!process.env.PWDEBUGIMPL,
+
   async streamFile(path: string, stream: Writable): Promise<void> {
     await pipelineAsync(fs.createReadStream(path), stream);
   },
diff --git a/packages/playwright-core/src/utils/isomorphic/rtti.ts b/packages/playwright-core/src/utils/isomorphic/rtti.ts
index 0bcaef0748..ffef6c1cad 100644
--- a/packages/playwright-core/src/utils/isomorphic/rtti.ts
+++ b/packages/playwright-core/src/utils/isomorphic/rtti.ts
@@ -27,5 +27,3 @@ export function isObject(obj: any): obj is NonNullable<object> {
 export function isError(obj: any): obj is Error {
   return obj instanceof Error || (obj && Object.getPrototypeOf(obj)?.name === 'Error');
 }
-
-export const isLikelyNpxGlobal = () => process.argv.length >= 2 && process.argv[1].includes('_npx');
diff --git a/packages/playwright-core/src/utils/isomorphic/stackTrace.ts b/packages/playwright-core/src/utils/isomorphic/stackTrace.ts
index 87d9e84eaa..f3d5a54da0 100644
--- a/packages/playwright-core/src/utils/isomorphic/stackTrace.ts
+++ b/packages/playwright-core/src/utils/isomorphic/stackTrace.ts
@@ -37,7 +37,7 @@ export function captureRawStack(): RawStack {
   return stack.split('\n');
 }
 
-export function parseStackFrame(text: string, pathSeparator: string): StackFrame | null {
+export function parseStackFrame(text: string, pathSeparator: string, showInternalStackFrames: boolean): StackFrame | null {
   const match = text && text.match(re);
   if (!match)
     return null;
@@ -46,7 +46,7 @@ export function parseStackFrame(text: string, pathSeparator: string): StackFrame
   let file = match[7];
   if (!file)
     return null;
-  if (!process.env.PWDEBUGIMPL && (file.startsWith('internal') || file.startsWith('node:')))
+  if (!showInternalStackFrames && (file.startsWith('internal') || file.startsWith('node:')))
     return null;
 
   const line = match[8];
diff --git a/packages/playwright/src/reporters/base.ts b/packages/playwright/src/reporters/base.ts
index 79d0d254a1..9708532cbb 100644
--- a/packages/playwright/src/reporters/base.ts
+++ b/packages/playwright/src/reporters/base.ts
@@ -522,7 +522,7 @@ export function prepareErrorStack(stack: string): {
   const stackLines = lines.slice(firstStackLine);
   let location: Location | undefined;
   for (const line of stackLines) {
-    const frame = parseStackFrame(line, path.sep);
+    const frame = parseStackFrame(line, path.sep, !!process.env.PWDEBUGIMPL);
     if (!frame || !frame.file)
       continue;
     if (belongsToNodeModules(frame.file))
diff --git a/packages/playwright/src/util.ts b/packages/playwright/src/util.ts
index d10babff56..d919ae5be7 100644
--- a/packages/playwright/src/util.ts
+++ b/packages/playwright/src/util.ts
@@ -55,7 +55,7 @@ export function filterStackFile(file: string) {
 export function filteredStackTrace(rawStack: RawStack): StackFrame[] {
   const frames: StackFrame[] = [];
   for (const line of rawStack) {
-    const frame = parseStackFrame(line, path.sep);
+    const frame = parseStackFrame(line, path.sep, !!process.env.PWDEBUGIMPL);
     if (!frame || !frame.file)
       continue;
     if (!filterStackFile(frame.file))