diff --git a/packages/isomorphic/trace/traceModel.ts b/packages/isomorphic/trace/traceModel.ts
index 459088a7e8305..eef67a59a6cec 100644
--- a/packages/isomorphic/trace/traceModel.ts
+++ b/packages/isomorphic/trace/traceModel.ts
@@ -38,7 +38,11 @@ export type SourceModel = {
   content: string | undefined;
 };
 
-export type ResourceEntry = ResourceSnapshot & { id: string, contextTitle: string };
+export type ResourceEntry = ResourceSnapshot & { id: string };
+
+export function resourceOwnerRef(resource: ResourceSnapshot): string | undefined {
+  return resource.pageref ?? resource._serviceWorkerRef ?? resource._apiRequestRef;
+}
 
 export type ActionTreeItem = {
   id: string;
@@ -84,7 +88,7 @@ export class TraceModel {
   readonly traceUri: string;
   readonly testTimeout?: number;
   readonly annotations?: trace.TraceEventAnnotation[];
-  readonly pagerefToTitle = new Map<string, string>();
+  readonly resourceOwnerRefToTitle = new Map<string, string>();
   private _eventsForAction = new Map<ActionEntry, (trace.EventTraceEvent | trace.ConsoleMessageTraceEvent)[]>();
   private _screenshots = new Map<string, trace.ScreenshotTraceEvent>();
   private _ariaSnapshots = new Map<string, trace.AriaSnapshotTraceEvent>();
@@ -116,12 +120,9 @@ export class TraceModel {
     this.hasSource = contexts.some(c => c.hasSource);
     this.hasStepData = contexts.some(context => context.origin === 'testRunner');
     this.resources = [];
-    let lastApiContextId = 0;
-    let lastBrowserContextId = 0;
-    for (const context of contexts) {
-      const contextTitle = context.resources.some(resource => resource._apiRequest) ? 'api#' + (++lastApiContextId) : 'browser#' + (++lastBrowserContextId);
-      for (const entry of context.resources)
-        this.resources.push({ ...entry, id: `${entry.pageref ?? lastApiContextId}-${entry.startedDateTime}-${entry.request.url}`, contextTitle });
+    for (let i = 0; i < contexts.length; ++i) {
+      for (const entry of contexts[i].resources)
+        this.resources.push({ ...entry, id: `${resourceOwnerRef(entry) ?? i}-${entry.startedDateTime}-${entry.request.url}` });
     }
     for (const context of contexts) {
       for (const event of context.screenshots || [])
@@ -133,10 +134,19 @@ export class TraceModel {
     this.attachments = this.actions.flatMap(action => action.attachments?.map(attachment => ({ ...attachment, callId: action.callId, traceUri })) ?? []);
     this.visibleAttachments = this.attachments.filter(attachment => !attachment.name.startsWith('_'));
 
-    this.pages.forEach((page, index) => this.pagerefToTitle.set(page.pageId, 'page#' + (index + 1)));
+    this.pages.forEach((page, index) => this.resourceOwnerRefToTitle.set(page.pageId, 'page#' + (index + 1)));
 
     this.events.sort((a1, a2) => a1.time - a2.time);
     this.resources.sort((a1, a2) => a1._monotonicTime! - a2._monotonicTime!);
+
+    let serviceWorkerCount = 0;
+    let apiRequestCount = 0;
+    for (const resource of this.resources) {
+      if (resource._serviceWorkerRef && !this.resourceOwnerRefToTitle.has(resource._serviceWorkerRef))
+        this.resourceOwnerRefToTitle.set(resource._serviceWorkerRef, `service-worker#${++serviceWorkerCount}`);
+      if (resource._apiRequestRef && !this.resourceOwnerRefToTitle.has(resource._apiRequestRef))
+        this.resourceOwnerRefToTitle.set(resource._apiRequestRef, `api#${++apiRequestCount}`);
+    }
     this.errorDescriptors = this.hasStepData ? this._errorDescriptorsFromTestRunner() : this._errorDescriptorsFromActions();
     this.sources = collectSources(this.actions, this.errorDescriptors);
 
diff --git a/packages/isomorphic/trace/traceModernizer.ts b/packages/isomorphic/trace/traceModernizer.ts
index f883aaa37f635..20047ddb4d73b 100644
--- a/packages/isomorphic/trace/traceModernizer.ts
+++ b/packages/isomorphic/trace/traceModernizer.ts
@@ -33,7 +33,11 @@ export class TraceVersionError extends Error {
 
 // 6 => 10/2023 ~1.40
 // 7 => 05/2024 ~1.45
-const latestVersion: trace.VERSION = 8;
+// 9 => 08/2026 ~1.63
+const latestVersion: trace.VERSION = 9;
+
+// Ensures distinct api request refs across contexts of the same trace.
+let lastApiRequestRefOrdinal = 0;
 
 export class TraceModernizer {
   private _contextEntry: ContextEntry;
@@ -43,6 +47,7 @@ export class TraceModernizer {
   private _pageEntries = new Map<string, PageEntry>();
   private _jsHandles = new Map<string, { preview: string }>();
   private _consoleObjects = new Map<string, { type: string, text: string, location: { url: string, lineNumber: number, columnNumber: number }, args?: { preview: string, value: string }[] }>();
+  private _apiRequestRef: string | undefined;
 
   constructor(contextEntry: ContextEntry, snapshotStorage: SnapshotStorage) {
     this._contextEntry = contextEntry;
@@ -492,4 +497,21 @@ export class TraceModernizer {
     }
     return result;
   }
+
+  _modernize_8_to_9(events: traceV8.TraceEvent[]): trace.TraceEvent[] {
+    for (const event of events) {
+      if (event.type !== 'resource-snapshot')
+        continue;
+      const snapshot = event.snapshot;
+      // Older traces marked api requests with a boolean instead of referencing
+      // their api request context.
+      if ((snapshot as any)._apiRequest) {
+        if (!this._apiRequestRef)
+          this._apiRequestRef = 'api-request-context@' + (++lastApiRequestRefOrdinal);
+        snapshot._apiRequestRef = this._apiRequestRef;
+        delete (snapshot as any)._apiRequest;
+      }
+    }
+    return events as trace.TraceEvent[];
+  }
 }
diff --git a/packages/playwright-core/src/server/har/harTracer.ts b/packages/playwright-core/src/server/har/harTracer.ts
index f24b39d6cd126..930746ea08d03 100644
--- a/packages/playwright-core/src/server/har/harTracer.ts
+++ b/packages/playwright-core/src/server/har/harTracer.ts
@@ -212,7 +212,7 @@ export class HarTracer {
     if (!this._shouldIncludeEntryWithUrl(event.url.toString()))
       return;
     const harEntry = createHarEntry(undefined, event.method, event.url, undefined, this._options);
-    harEntry._apiRequest = true;
+    harEntry._apiRequestRef = this._context.guid;
     if (!this._options.omitCookies)
       harEntry.request.cookies = event.cookies;
     harEntry.request.headers = Object.entries(event.headers).map(([name, value]) => ({ name, value }));
@@ -285,6 +285,9 @@ export class HarTracer {
 
     const pageEntry = this._createPageEntryIfNeeded(page);
     const harEntry = createHarEntry(pageEntry?.id, request.method(), url, request.frame()?.guid, this._options, request.wallTimeMs());
+    const serviceWorker = request.serviceWorker();
+    if (serviceWorker)
+      harEntry._serviceWorkerRef = serviceWorker.guid;
     harEntry._resourceType = request.resourceType();
     this._recordRequestHeadersAndCookies(harEntry, request.headers());
     harEntry.request.postData = this._postDataForRequest(request, this._options.content);
diff --git a/packages/playwright-core/src/server/trace/recorder/tracing.ts b/packages/playwright-core/src/server/trace/recorder/tracing.ts
index c8732eb513d47..b296ba9a242c2 100644
--- a/packages/playwright-core/src/server/trace/recorder/tracing.ts
+++ b/packages/playwright-core/src/server/trace/recorder/tracing.ts
@@ -56,7 +56,7 @@ import type { Progress } from '../../progress';
 import type * as types from '../../types';
 import type { Screencast, ScreencastClient } from '../../screencast';
 
-const version: trace.VERSION = 8;
+const version: trace.VERSION = 9;
 
 export type TracerOptions = {
   name?: string;
diff --git a/packages/playwright-core/src/tools/trace/traceRequests.ts b/packages/playwright-core/src/tools/trace/traceRequests.ts
index c2a21e82ca309..beb7d92cf1300 100644
--- a/packages/playwright-core/src/tools/trace/traceRequests.ts
+++ b/packages/playwright-core/src/tools/trace/traceRequests.ts
@@ -183,14 +183,14 @@ function bytesToString(bytes: number): string {
   return gb.toFixed(1) + 'G';
 }
 
-function formatRouteStatus(r: { _wasAborted?: boolean, _wasContinued?: boolean, _wasFulfilled?: boolean, _apiRequest?: boolean }): string {
+function formatRouteStatus(r: { _wasAborted?: boolean, _wasContinued?: boolean, _wasFulfilled?: boolean, _apiRequestRef?: string }): string {
   if (r._wasAborted)
     return 'aborted';
   if (r._wasContinued)
     return 'continued';
   if (r._wasFulfilled)
     return 'fulfilled';
-  if (r._apiRequest)
+  if (r._apiRequestRef)
     return 'api';
   return '';
 }
diff --git a/packages/playwright/src/worker/testTracing.ts b/packages/playwright/src/worker/testTracing.ts
index 1daa10ae1ccf5..962e945b7b6e2 100644
--- a/packages/playwright/src/worker/testTracing.ts
+++ b/packages/playwright/src/worker/testTracing.ts
@@ -34,7 +34,7 @@ import type EventEmitter from 'events';
 
 export type Attachment = TestInfo['attachments'][0];
 export const testTraceEntryName = 'test.trace';
-const version: trace.VERSION = 8;
+const version: trace.VERSION = 9;
 let traceOrdinal = 0;
 
 type TraceFixtureValue =  PlaywrightWorkerOptions['trace'] | undefined;
diff --git a/packages/trace-viewer/src/ui/consoleTab.tsx b/packages/trace-viewer/src/ui/consoleTab.tsx
index e8ec8df517b39..1c0a2bfabda2e 100644
--- a/packages/trace-viewer/src/ui/consoleTab.tsx
+++ b/packages/trace-viewer/src/ui/consoleTab.tsx
@@ -65,7 +65,7 @@ export function useConsoleTabModel(model: TraceModel | undefined, selectedTime:
   const { entries } = React.useMemo(() => {
     if (!model)
       return { entries: [] };
-    const pageTitle = (id: string | undefined) => (id && model.pagerefToTitle.get(id)) || '';
+    const pageTitle = (id: string | undefined) => (id && model.resourceOwnerRefToTitle.get(id)) || '';
     const entries: ConsoleEntry[] = [];
     function addEntry(entry: Omit<ConsoleEntry, 'repeat'>) {
       const lastEntry = entries[entries.length - 1];
diff --git a/packages/trace-viewer/src/ui/networkTab.tsx b/packages/trace-viewer/src/ui/networkTab.tsx
index d7b4d1a0781be..12899215b23a4 100644
--- a/packages/trace-viewer/src/ui/networkTab.tsx
+++ b/packages/trace-viewer/src/ui/networkTab.tsx
@@ -20,6 +20,7 @@ import './networkTab.css';
 import { NetworkResourceDetails, WebSocketResourceDetails } from './networkResourceDetails';
 import { bytesToString, msToString } from '@isomorphic/formatUtils';
 import { PlaceholderPanel } from './placeholderPanel';
+import { resourceOwnerRef } from '@isomorphic/trace/traceModel';
 import type { ResourceEntry, TraceModel } from '@isomorphic/trace/traceModel';
 import { GridView, type RenderedGridCell } from '@web/components/gridView';
 import { SplitView } from '@web/components/splitView';
@@ -216,13 +217,10 @@ const renderCell = (entry: RenderedEntry, column: ColumnName): RenderedGridCell
 };
 
 function resourceContextId(model: TraceModel | undefined, resource: ResourceEntry): string {
-  if (!model)
+  const ownerRef = resourceOwnerRef(resource);
+  if (!model || !ownerRef)
     return '';
-  if (resource.pageref)
-    return model.pagerefToTitle.get(resource.pageref) || '';
-  if (resource._apiRequest)
-    return resource.contextTitle;
-  return '';
+  return model.resourceOwnerRefToTitle.get(ownerRef) || '';
 }
 
 const renderEntry = (resource: ResourceEntry, boundaries: Boundaries, model: TraceModel | undefined): RenderedEntry => {
@@ -275,7 +273,7 @@ function formatRouteStatus(request: ResourceEntry): string {
     return 'continued';
   if (request._wasFulfilled)
     return 'fulfilled';
-  if (request._apiRequest)
+  if (request._apiRequestRef)
     return 'api';
   return '';
 }
diff --git a/packages/trace/src/har.ts b/packages/trace/src/har.ts
index 3711f033d55a2..054f3d29489ed 100644
--- a/packages/trace/src/har.ts
+++ b/packages/trace/src/har.ts
@@ -71,7 +71,8 @@ export type Entry = {
   _wasAborted?: boolean;
   _wasFulfilled?: boolean;
   _wasContinued?: boolean;
-  _apiRequest?: boolean;
+  _serviceWorkerRef?: string;
+  _apiRequestRef?: string;
   _resourceType?: string;
   _webSocketMessages?: WebSocketMessage[];
 };
diff --git a/packages/trace/src/trace.ts b/packages/trace/src/trace.ts
index e5317b8b0825b..a0ef448183be5 100644
--- a/packages/trace/src/trace.ts
+++ b/packages/trace/src/trace.ts
@@ -68,7 +68,7 @@ export type SerializedError = {
 };
 
 // Make sure you add _modernize_N_to_N1(event: any) to traceModernizer.ts.
-export type VERSION = 8;
+export type VERSION = 9;
 
 export type BrowserContextEventOptions = {
   baseURL?: string,
diff --git a/tests/library/trace-viewer.spec.ts b/tests/library/trace-viewer.spec.ts
index fcc9323add279..d9a7a02f15f8d 100644
--- a/tests/library/trace-viewer.spec.ts
+++ b/tests/library/trace-viewer.spec.ts
@@ -518,6 +518,21 @@ test('should have network requests', async ({ showTraceViewer }) => {
   await expect(traceViewer.networkRequests.filter({ hasText: '404GET404text' })).toHaveCSS('background-color', 'rgb(242, 222, 222)');
 });
 
+test('should attribute network requests to service workers', async ({ runAndTrace, page, context, server, browserName }) => {
+  test.skip(browserName !== 'chromium', 'Service worker requests are only reported in Chromium');
+  const traceViewer = await runAndTrace(async () => {
+    const [worker] = await Promise.all([
+      context.waitForEvent('serviceworker'),
+      page.goto(server.PREFIX + '/serviceworkers/fetch/sw.html'),
+    ]);
+    await page.evaluate(() => window['activationPromise']);
+    await worker.evaluate(() => fetch('/one-style.css'));
+  });
+  await traceViewer.showNetworkTab();
+  await expect(traceViewer.networkRequests.filter({ hasText: 'sw.html' })).toContainText(['page#1']);
+  await expect(traceViewer.networkRequests.filter({ hasText: 'one-style.css' })).toContainText(['service-worker#1']);
+});
+
 test('should highlight network request on timeline on hover', async ({ showTraceViewer }) => {
   const traceViewer = await showTraceViewer(traceFile);
   await traceViewer.selectAction('Navigate');
diff --git a/tests/library/tracing.spec.ts b/tests/library/tracing.spec.ts
index 0f9a165b38170..16e2ae51d8d69 100644
--- a/tests/library/tracing.spec.ts
+++ b/tests/library/tracing.spec.ts
@@ -224,7 +224,7 @@ test('should record context API request trace independently', async ({ context,
   const browserTrace = await parseTraceRaw(browserTracePath);
   expect(browserTrace.actions).toContain('Navigate to "/one-style.html"');
   expect(browserTrace.actions).not.toContain('POST "/simple.json"');
-  expect(browserTrace.events.some(event => event.type === 'resource-snapshot' && event.snapshot._apiRequest)).toBe(false);
+  expect(browserTrace.events.some(event => event.type === 'resource-snapshot' && event.snapshot.request.url.endsWith('/simple.json'))).toBe(false);
   expect(browserTrace.events.some(event => event.type === 'resource-snapshot' && event.snapshot.request.url.endsWith('/one-style.html'))).toBe(true);
 
   const apiTrace = await parseTraceRaw(apiTracePath);
@@ -233,6 +233,7 @@ test('should record context API request trace independently', async ({ context,
   const apiAction = apiTrace.actionObjects.find(action => action.class === 'APIRequestContext' && action.method === 'fetch')!;
   expect(relativeStack(apiAction, apiTrace.stacks)).toEqual(['tracing.spec.ts']);
   expect(apiTrace.events.filter(event => event.type === 'resource-snapshot').map(event => event.snapshot.request.url)).toEqual([apiURL]);
+  expect(apiTrace.events.filter(event => event.type === 'resource-snapshot').map(event => event.snapshot._apiRequestRef)).toEqual([expect.stringMatching(/^request-context@/)]);
 });
 
 test('should collect two traces', async ({ context, page, server }, testInfo) => {
diff --git a/tests/playwright-test/playwright.trace.spec.ts b/tests/playwright-test/playwright.trace.spec.ts
index fea0550e8d64f..b7847e7834f24 100644
--- a/tests/playwright-test/playwright.trace.spec.ts
+++ b/tests/playwright-test/playwright.trace.spec.ts
@@ -238,7 +238,7 @@ test('should not mixup network files between contexts', async ({ runInlineTest,
   expect(apiURLsByTrace.every(urls => urls.length <= 1)).toBe(true);
   expect(apiURLsByTrace.flat().sort()).toEqual(apiURLs);
   const trace = await parseTrace(tracePath);
-  expect(trace.model.resources.filter(resource => resource._apiRequest).map(resource => resource.request.url).sort()).toEqual(apiURLs);
+  expect(trace.model.resources.filter(resource => resource._apiRequestRef).map(resource => resource.request.url).sort()).toEqual(apiURLs);
 });
 
 test('should save sources when requested', async ({ runInlineTest }, testInfo) => {