diff --git a/src/server/chromium/crExecutionContext.ts b/src/server/chromium/crExecutionContext.ts
index 6543d613ab..9202230774 100644
--- a/src/server/chromium/crExecutionContext.ts
+++ b/src/server/chromium/crExecutionContext.ts
@@ -19,7 +19,6 @@ import { CRSession } from './crConnection';
 import { getExceptionMessage, releaseObject } from './crProtocolHelper';
 import { Protocol } from './protocol';
 import * as js from '../javascript';
-import * as sourceMap from '../../utils/sourceMap';
 import { rewriteErrorMessage } from '../../utils/stackTrace';
 import { parseEvaluationResultValue } from '../common/utilityScriptSerializers';
 
@@ -34,7 +33,7 @@ export class CRExecutionContext implements js.ExecutionContextDelegate {
 
   async rawEvaluate(expression: string): Promise<string> {
     const { exceptionDetails, result: remoteObject } = await this._client.send('Runtime.evaluate', {
-      expression: sourceMap.ensureSourceUrl(expression),
+      expression,
       contextId: this._contextId,
     }).catch(rewriteError);
     if (exceptionDetails)
diff --git a/src/server/chromium/crPage.ts b/src/server/chromium/crPage.ts
index 88b20d084f..b4dbb96bf0 100644
--- a/src/server/chromium/crPage.ts
+++ b/src/server/chromium/crPage.ts
@@ -35,7 +35,6 @@ import { CRPDF } from './crPdf';
 import { CRBrowserContext } from './crBrowser';
 import * as types from '../types';
 import { ConsoleMessage } from '../console';
-import * as sourceMap from '../../utils/sourceMap';
 import { rewriteErrorMessage } from '../../utils/stackTrace';
 import { assert, headersArrayToObject, createGuid } from '../../utils/utils';
 import { VideoRecorder } from './videoRecorder';
@@ -425,7 +424,7 @@ class FrameSession {
       lifecycleEventsEnabled = this._client.send('Page.setLifecycleEventsEnabled', { enabled: true }),
       this._client.send('Runtime.enable', {}),
       this._client.send('Page.addScriptToEvaluateOnNewDocument', {
-        source: sourceMap.generateSourceUrl(),
+        source: '',
         worldName: UTILITY_WORLD_NAME,
       }),
       this._networkManager.initialize(),
diff --git a/src/server/firefox/ffExecutionContext.ts b/src/server/firefox/ffExecutionContext.ts
index cd3c89a406..3d2e20d98d 100644
--- a/src/server/firefox/ffExecutionContext.ts
+++ b/src/server/firefox/ffExecutionContext.ts
@@ -18,7 +18,6 @@
 import * as js from '../javascript';
 import { FFSession } from './ffConnection';
 import { Protocol } from './protocol';
-import * as sourceMap from '../../utils/sourceMap';
 import { rewriteErrorMessage } from '../../utils/stackTrace';
 import { parseEvaluationResultValue } from '../common/utilityScriptSerializers';
 
@@ -33,7 +32,7 @@ export class FFExecutionContext implements js.ExecutionContextDelegate {
 
   async rawEvaluate(expression: string): Promise<string> {
     const payload = await this._session.send('Runtime.evaluate', {
-      expression: sourceMap.ensureSourceUrl(expression),
+      expression,
       returnByValue: false,
       executionContextId: this._executionContextId,
     }).catch(rewriteError);
diff --git a/src/server/javascript.ts b/src/server/javascript.ts
index 298c086a78..0c608206a6 100644
--- a/src/server/javascript.ts
+++ b/src/server/javascript.ts
@@ -140,7 +140,7 @@ export class JSHandle<T = any> {
     if (!this._objectId)
       return this._value;
     const utilityScript = await this._context.utilityScript();
-    const script = `(utilityScript, ...args) => utilityScript.jsonValue(...args)` + sourceMap.generateSourceUrl();
+    const script = `(utilityScript, ...args) => utilityScript.jsonValue(...args)`;
     return this._context._delegate.evaluateWithArguments(script, true, utilityScript, [true], [this._objectId]);
   }
 
@@ -177,8 +177,8 @@ export async function evaluate(context: ExecutionContext, returnByValue: boolean
 export async function evaluateExpression(context: ExecutionContext, returnByValue: boolean, expression: string, isFunction: boolean, ...args: any[]): Promise<any> {
   const utilityScript = await context.utilityScript();
   if (!isFunction) {
-    const script = `(utilityScript, ...args) => utilityScript.evaluate(...args)` + sourceMap.generateSourceUrl();
-    return context._delegate.evaluateWithArguments(script, returnByValue, utilityScript, [returnByValue, sourceMap.ensureSourceUrl(expression)], []);
+    const script = `(utilityScript, ...args) => utilityScript.evaluate(...args)`;
+    return context._delegate.evaluateWithArguments(script, returnByValue, utilityScript, [returnByValue, expression], []);
   }
 
   let functionText = expression;
@@ -232,7 +232,7 @@ export async function evaluateExpression(context: ExecutionContext, returnByValu
   // See UtilityScript for arguments.
   const utilityScriptValues = [returnByValue, functionText, args.length, ...args];
 
-  const script = `(utilityScript, ...args) => utilityScript.callFunction(...args)` + sourceMap.generateSourceUrl();
+  const script = `(utilityScript, ...args) => utilityScript.callFunction(...args)`;
   try {
     return await context._delegate.evaluateWithArguments(script, returnByValue, utilityScript, utilityScriptValues, utilityScriptObjectIds);
   } finally {
diff --git a/src/server/webkit/wkExecutionContext.ts b/src/server/webkit/wkExecutionContext.ts
index 0d636998d0..ff5f36e2a3 100644
--- a/src/server/webkit/wkExecutionContext.ts
+++ b/src/server/webkit/wkExecutionContext.ts
@@ -19,7 +19,6 @@ import { WKSession, isSwappedOutError } from './wkConnection';
 import { Protocol } from './protocol';
 import * as js from '../javascript';
 import { parseEvaluationResultValue } from '../common/utilityScriptSerializers';
-import * as sourceMap from '../../utils/sourceMap';
 
 export class WKExecutionContext implements js.ExecutionContextDelegate {
   private readonly _session: WKSession;
@@ -42,7 +41,7 @@ export class WKExecutionContext implements js.ExecutionContextDelegate {
   async rawEvaluate(expression: string): Promise<string> {
     try {
       const response = await this._session.send('Runtime.evaluate', {
-        expression: sourceMap.ensureSourceUrl(expression),
+        expression,
         contextId: this._contextId,
         returnByValue: false
       });
@@ -96,7 +95,7 @@ export class WKExecutionContext implements js.ExecutionContextDelegate {
   private async _returnObjectByValue(utilityScript: js.JSHandle<any>, objectId: Protocol.Runtime.RemoteObjectId): Promise<any> {
     try {
       const serializeResponse = await this._session.send('Runtime.callFunctionOn', {
-        functionDeclaration: 'object => object' + sourceMap.generateSourceUrl(),
+        functionDeclaration: 'object => object',
         objectId: utilityScript._objectId!,
         arguments: [ { objectId } ],
         returnByValue: true
diff --git a/src/utils/sourceMap.ts b/src/utils/sourceMap.ts
index 3237a82385..ff4d28b7ba 100644
--- a/src/utils/sourceMap.ts
+++ b/src/utils/sourceMap.ts
@@ -24,23 +24,11 @@ type Position = {
   column: number;
 };
 
-let sourceUrlCounter = 0;
-const playwrightSourceUrlPrefix = '__playwright_evaluation_script__';
-const sourceUrlRegex = /^[\040\t]*\/\/[@#] sourceURL=\s*(\S*?)\s*$/m;
-
-export function ensureSourceUrl(expression: string): string {
-  return sourceUrlRegex.test(expression) ? expression : expression + generateSourceUrl();
-}
-
 export async function generateSourceMapUrl(functionText: string, generatedText: string): Promise<string> {
   if (!isDebugMode())
     return '';
   const sourceMapUrl = await innerGenerateSourceMapUrl(functionText, generatedText);
-  return sourceMapUrl || generateSourceUrl();
-}
-
-export function generateSourceUrl(): string {
-  return isDebugMode() ? `\n//# sourceURL=${playwrightSourceUrlPrefix}${sourceUrlCounter++}\n` : '';
+  return sourceMapUrl || '';
 }
 
 async function innerGenerateSourceMapUrl(functionText: string, generatedText: string): Promise<string | undefined> {