diff --git a/README.md b/README.md
index 0fe59e86..bc9b756a 100644
--- a/README.md
+++ b/README.md
@@ -179,7 +179,7 @@ import type {Pack} from 'autotests/configurator';
  */
 export const pack: Pack = {
   ...allTestsPack,
-  browserInitTimeout: 40_000,
+  testIdleTimeout: 10_000,
 };
 ```
 
diff --git a/autotests/actions/setPageCookiesAndNavigateToUrl.ts b/autotests/actions/setPageCookiesAndNavigateToUrl.ts
index 77818565..b7fe7ba8 100644
--- a/autotests/actions/setPageCookiesAndNavigateToUrl.ts
+++ b/autotests/actions/setPageCookiesAndNavigateToUrl.ts
@@ -2,7 +2,7 @@ import {setHeadersAndNavigateToUrl} from 'e2ed/actions';
 import {LogEventType} from 'e2ed/constants';
 import {getHeaderValue, log, replaceSetCookie} from 'e2ed/utils';
 
-import type {Cookie, Headers, Url} from 'e2ed/types';
+import type {Cookie, SetCookieHeaderString, StringHeaders, Url} from 'e2ed/types';
 
 /**
  * Navigate to the url and set custom page cookies.
@@ -11,18 +11,19 @@ export const setPageCookiesAndNavigateToUrl = async (
   url: Url,
   pageCookies: readonly Cookie[],
 ): Promise<void> => {
-  const mapResponseHeaders = (headers: Headers): Headers => {
-    let setCookies = getHeaderValue(headers, 'set-cookie');
+  const mapResponseHeaders = (headers: StringHeaders): StringHeaders => {
+    let cookiesArray: SetCookieHeaderString[] = [];
+    const setCookies = getHeaderValue(headers, 'set-cookie');
 
-    if (setCookies === undefined) {
-      setCookies = [];
+    if (setCookies !== undefined) {
+      cookiesArray.push(setCookies as SetCookieHeaderString);
     }
 
     for (const cookie of pageCookies) {
-      setCookies = replaceSetCookie(setCookies, cookie);
+      cookiesArray = replaceSetCookie(cookiesArray, cookie);
     }
 
-    return {'set-cookie': setCookies};
+    return {'set-cookie': cookiesArray.join('\n')};
   };
 
   log(`Navigate to ${url} and set page cookie`, {pageCookies, url}, LogEventType.Action);
diff --git a/autotests/actions/setPageRequestHeadersAndNavigateToUrl.ts b/autotests/actions/setPageRequestHeadersAndNavigateToUrl.ts
index a2ce174b..4879f5ec 100644
--- a/autotests/actions/setPageRequestHeadersAndNavigateToUrl.ts
+++ b/autotests/actions/setPageRequestHeadersAndNavigateToUrl.ts
@@ -2,16 +2,16 @@ import {setHeadersAndNavigateToUrl} from 'e2ed/actions';
 import {LogEventType} from 'e2ed/constants';
 import {log} from 'e2ed/utils';
 
-import type {Headers, Url} from 'e2ed/types';
+import type {StringHeaders, Url} from 'e2ed/types';
 
 /**
  * Navigate to the url and set additional page request headers.
  */
 export const setPageRequestHeadersAndNavigateToUrl = async (
   url: Url,
-  pageRequestHeaders: Headers,
+  pageRequestHeaders: StringHeaders,
 ): Promise<void> => {
-  const mapRequestHeaders = (): Headers => pageRequestHeaders;
+  const mapRequestHeaders = (): StringHeaders => pageRequestHeaders;
 
   log(
     `Navigate to ${url} and set page request headers`,
diff --git a/autotests/packs/allTests.ts b/autotests/packs/allTests.ts
index c37868a2..735b8e20 100644
--- a/autotests/packs/allTests.ts
+++ b/autotests/packs/allTests.ts
@@ -47,7 +47,6 @@ export const pack: Pack = {
   assertionTimeout: 5_000,
   browser,
   browserFlags,
-  browserInitTimeout: 60_000,
   concurrency: isLocalRun ? 1 : 2,
   customPackProperties: {internalPackRunId: 0, name: 'allTests'},
   doAfterPack,
diff --git a/autotests/packs/local.example.ts b/autotests/packs/local.example.ts
index 8d1caf07..a4d9d363 100644
--- a/autotests/packs/local.example.ts
+++ b/autotests/packs/local.example.ts
@@ -3,9 +3,9 @@ import {pack as allTestsPack} from './allTests';
 import type {Pack} from 'autotests/configurator';
 
 /**
- * Pack from .gitignore for local development.
+ * Pack from `.gitignore` for local development.
  */
 export const pack: Pack = {
   ...allTestsPack,
-  browserInitTimeout: 40_000,
+  testIdleTimeout: 10_000,
 };
diff --git a/autotests/pageObjects/pages/E2edReportExample/E2edReportExample.ts b/autotests/pageObjects/pages/E2edReportExample/E2edReportExample.ts
index 61da5d18..7049b5f8 100644
--- a/autotests/pageObjects/pages/E2edReportExample/E2edReportExample.ts
+++ b/autotests/pageObjects/pages/E2edReportExample/E2edReportExample.ts
@@ -10,9 +10,11 @@ import {createPageObjectsFromMultiLocator, setReadonlyProperty} from 'e2ed/utils
 
 import {TestRunButton} from './TestRunButton';
 
-import type {Cookie, Headers, Selector, Url} from 'e2ed/types';
+import type {Cookie, Selector, StringHeaders, Url} from 'e2ed/types';
 
-type CustomPageParams = {pageCookies?: readonly Cookie[]; pageRequestHeaders?: Headers} | undefined;
+type CustomPageParams =
+  | {pageCookies?: readonly Cookie[]; pageRequestHeaders?: StringHeaders}
+  | undefined;
 
 /**
  * The e2ed report example page.
@@ -44,7 +46,7 @@ export class E2edReportExample extends Page<CustomPageParams> {
   /**
    * Request headers that we add to page request.
    */
-  readonly pageRequestHeaders: Headers | undefined;
+  readonly pageRequestHeaders: StringHeaders | undefined;
 
   override readonly pageStabilizationInterval = 600;
 
diff --git a/src/actions/asserts/assertUrlMatchRoute.ts b/src/actions/asserts/assertUrlMatchRoute.ts
index d728e59d..fb51c630 100644
--- a/src/actions/asserts/assertUrlMatchRoute.ts
+++ b/src/actions/asserts/assertUrlMatchRoute.ts
@@ -10,7 +10,6 @@ type MaybeUrlOrPath = Url | string | null | undefined;
 
 /**
  * Asserts that url or url path (which can be wrapped in a promise) match route.
- * TODO: support Smart Assertions.
  */
 export const assertUrlMatchRoute = async (
   maybeUrlOrPath: MaybeUrlOrPath | Promise<MaybeUrlOrPath>,
diff --git a/src/types/config/config.ts b/src/types/config/config.ts
index 7ebb048c..b50e2a7d 100644
--- a/src/types/config/config.ts
+++ b/src/types/config/config.ts
@@ -16,7 +16,6 @@ import type {OwnE2edConfig} from './ownE2edConfig';
 type UserlandTestCafeConfig = Readonly<{
   ajaxRequestTimeout: number;
   assertionTimeout: number;
-  browserInitTimeout: number;
   concurrency: number;
   pageRequestTimeout: number;
   port1: number;
diff --git a/src/types/http/http.ts b/src/types/http/http.ts
index dce48104..1fde72e2 100644
--- a/src/types/http/http.ts
+++ b/src/types/http/http.ts
@@ -26,7 +26,7 @@ export type Headers = Readonly<
  * Maps headers to new (overridden) headers.
  * All headers must be in lower case.
  */
-export type MapHeaders = (this: void, headers: Headers) => Headers;
+export type MapHeaders = (this: void, headers: StringHeaders) => StringHeaders;
 
 /**
  * Options for mappers of headers.
@@ -117,6 +117,11 @@ export type ResponseWithRequest<
 }> &
   SomeResponse;
 
+/**
+ * Headers as strings.
+ */
+export type StringHeaders = Readonly<Record<string, string>>;
+
 /**
  * Brand type for the full url string.
  */
diff --git a/src/types/http/index.ts b/src/types/http/index.ts
index 16d954ec..78f9ee7d 100644
--- a/src/types/http/index.ts
+++ b/src/types/http/index.ts
@@ -10,6 +10,7 @@ export type {
   RequestWithUtcTimeInMs,
   Response,
   ResponseWithRequest,
+  StringHeaders,
   Url,
 } from './http';
 export type {RequestKeyType, ResponseKeyType} from './internalKeys';
diff --git a/src/types/index.ts b/src/types/index.ts
index 7d815ca4..440eb505 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -31,6 +31,7 @@ export type {
   SameSite,
   SetCookieHeaderString,
   StatusCode,
+  StringHeaders,
   Url,
 } from './http';
 export type {KeyboardPressKey} from './keyboard';
diff --git a/src/types/internal.ts b/src/types/internal.ts
index 2fcbcc18..d79d22b8 100644
--- a/src/types/internal.ts
+++ b/src/types/internal.ts
@@ -54,6 +54,7 @@ export type {
   SameSite,
   SetCookieHeaderString,
   StatusCode,
+  StringHeaders,
   Url,
 } from './http';
 export type {KeyboardPressKey} from './keyboard';
diff --git a/src/utils/config/assertUserlandPack.ts b/src/utils/config/assertUserlandPack.ts
index 08f0d5ea..fe426d8d 100644
--- a/src/utils/config/assertUserlandPack.ts
+++ b/src/utils/config/assertUserlandPack.ts
@@ -6,7 +6,7 @@ import type {UserlandPack} from '../../types/internal';
  * Asserts that userland pack is correct.
  * @internal
  */
-// eslint-disable-next-line max-lines-per-function, max-statements
+// eslint-disable-next-line max-lines-per-function
 export const assertUserlandPack = (userlandPack: UserlandPack): void => {
   const logParams = {userlandPack};
 
@@ -28,12 +28,6 @@ export const assertUserlandPack = (userlandPack: UserlandPack): void => {
     logParams,
   );
 
-  assertNumberIsPositiveInteger(
-    userlandPack.browserInitTimeout,
-    'browserInitTimeout is positive integer',
-    logParams,
-  );
-
   assertNumberIsPositiveInteger(
     userlandPack.maxRetriesCountInDocker,
     'maxRetriesCountInDocker is positive integer',
diff --git a/src/utils/report/writeLiteJsonReport.ts b/src/utils/report/writeLiteJsonReport.ts
index 5a0077fd..ef1bddc8 100644
--- a/src/utils/report/writeLiteJsonReport.ts
+++ b/src/utils/report/writeLiteJsonReport.ts
@@ -8,6 +8,8 @@ import {getDurationWithUnits} from '../getDurationWithUnits';
 
 import type {FilePathFromRoot, LiteReport, UtcTimeInMs} from '../../types/internal';
 
+const bytesInKb = 1_024;
+
 /**
  * Writes lite JSON report (`lite-report.json` file) with test runs results
  * (and without test run logs).
@@ -23,11 +25,13 @@ export const writeLiteJsonReport = async (liteReport: LiteReport): Promise<void>
 
   await writeFile(reportFilePath, reportJson);
 
-  const reportFileSize = await getFileSize(reportFilePath);
+  const reportFileSizeInBytes = await getFileSize(reportFilePath);
+
+  const reportFileSizeInKb = (reportFileSizeInBytes / bytesInKb).toFixed(2);
 
   const durationWithUnits = getDurationWithUnits(Date.now() - startTimeInMs);
 
   generalLog(
-    `Lite JSON report was written (${reportFileSize} bytes) to "${reportFilePath}" in ${durationWithUnits}`,
+    `Lite JSON report was written (${reportFileSizeInKb} bytes) to "${reportFilePath}" in ${durationWithUnits}`,
   );
 };
diff --git a/src/utils/requestHooks/applyHeadersMapper.ts b/src/utils/requestHooks/applyHeadersMapper.ts
index ea98b918..96896289 100644
--- a/src/utils/requestHooks/applyHeadersMapper.ts
+++ b/src/utils/requestHooks/applyHeadersMapper.ts
@@ -1,17 +1,16 @@
-import {getCopyOfHeaders} from './getCopyOfHeaders';
 import {getEquivalentHeadersNames} from './getEquivalentHeadersNames';
 
-import type {Headers, MapHeaders, Mutable} from '../../types/internal';
+import type {MapHeaders, Mutable, StringHeaders} from '../../types/internal';
 
 /**
  * Map exists headers to new headers and merge this new headers to exists headers.
  * @internal
  */
-export const applyHeadersMapper = (headers: Headers, mapper: MapHeaders): void => {
-  const copyOfHeaders = getCopyOfHeaders(headers);
+export const applyHeadersMapper = (headers: StringHeaders, mapper: MapHeaders): void => {
+  const copyOfHeaders = {...headers};
   const newHeaders = mapper(copyOfHeaders);
 
-  const mutableHeaders: Mutable<Headers> = headers;
+  const mutableHeaders: Mutable<StringHeaders> = headers;
 
   for (const [name, value] of Object.entries(newHeaders)) {
     if (value === undefined) {
@@ -22,7 +21,7 @@ export const applyHeadersMapper = (headers: Headers, mapper: MapHeaders): void =
         delete mutableHeaders[currentName];
       }
     } else {
-      mutableHeaders[name] = value as string[] | string | undefined;
+      mutableHeaders[name] = value;
     }
   }
 };
diff --git a/src/utils/requestHooks/getCopyOfHeaders.ts b/src/utils/requestHooks/getCopyOfHeaders.ts
deleted file mode 100644
index 9325b170..00000000
--- a/src/utils/requestHooks/getCopyOfHeaders.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import type {Headers} from '../../types/internal';
-
-/**
- * Get copy of headers object.
- * @internal
- */
-export const getCopyOfHeaders = (headers: Headers): Headers => {
-  const copyOfHeaders = {...headers};
-
-  for (const [key, value] of Object.entries(copyOfHeaders)) {
-    if (Array.isArray(value)) {
-      copyOfHeaders[key] = [...value];
-    }
-  }
-
-  return copyOfHeaders;
-};
diff --git a/src/utils/test/preparePage.ts b/src/utils/test/preparePage.ts
index 5240d476..2d6a8a3d 100644
--- a/src/utils/test/preparePage.ts
+++ b/src/utils/test/preparePage.ts
@@ -4,7 +4,6 @@ import {getIsPageNavigatingNow, setIsPageNavigatingNow} from '../../context/isPa
 import {getNavigationDelay} from '../../context/navigationDelay';
 import {getOnResponseCallbacks} from '../../context/onResponseCallbacks';
 
-import {assertValueIsNotNull} from '../asserts';
 import {getResponseFromPlaywrightResponse} from '../requestHooks';
 
 import type {Page} from '@playwright/test';
@@ -76,9 +75,17 @@ export const preparePage = async (page: Page): Promise<void> => {
         return;
       }
 
-      const playwrightResponse = await request.response();
+      const playwrightResponse = await request.response().catch((error) => {
+        if (String(error).includes('Target page, context or browser has been closed')) {
+          return null;
+        }
 
-      assertValueIsNotNull(playwrightResponse, 'response is not null', {url: request.url()});
+        throw error;
+      });
+
+      if (playwrightResponse === null) {
+        return;
+      }
 
       const responseWithRequest = await getResponseFromPlaywrightResponse(playwrightResponse);
 
diff --git a/src/utils/tests/runTests.ts b/src/utils/tests/runTests.ts
index 10c20ff3..556ae8fd 100644
--- a/src/utils/tests/runTests.ts
+++ b/src/utils/tests/runTests.ts
@@ -24,7 +24,7 @@ export const runTests = async ({runLabel}: RunRetryOptions): Promise<void> => {
   setRunLabel(runLabel);
 
   try {
-    const {browserInitTimeout, enableLiveMode, resourceUsageReadingInternal} = getFullPackConfig();
+    const {enableLiveMode, testIdleTimeout, resourceUsageReadingInternal} = getFullPackConfig();
 
     startResourceUsageReading(resourceUsageReadingInternal);
 
@@ -36,7 +36,7 @@ export const runTests = async ({runLabel}: RunRetryOptions): Promise<void> => {
 
         beforeRunFirstTest();
       }
-    }, browserInitTimeout);
+    }, testIdleTimeout);
 
     beforeRunFirstTestTimeoutId.unref();
 
diff --git a/src/utils/tests/stripExtraLogs.ts b/src/utils/tests/stripExtraLogs.ts
index 9b9d748e..3465c11e 100644
--- a/src/utils/tests/stripExtraLogs.ts
+++ b/src/utils/tests/stripExtraLogs.ts
@@ -1,3 +1,5 @@
+import {sep} from 'node:path';
+
 /**
  * Strip extra Playwright logs.
  * @internal
@@ -8,7 +10,7 @@ export const stripExtraLogs = (text: string): string => {
   for (let index = 0; index < lines.length; index += 1) {
     const line = lines[index];
 
-    if (line?.includes('../node_modules/e2ed/test.js:')) {
+    if (line?.includes(`${sep}node_modules${sep}e2ed${sep}test.js:`)) {
       const startIndex = line.indexOf('›');
       const endIndex = line.lastIndexOf('›');