diff --git a/packages/playwright-core/src/server/fetch.ts b/packages/playwright-core/src/server/fetch.ts
index 00d7aa3f34..58921d11f4 100644
--- a/packages/playwright-core/src/server/fetch.ts
+++ b/packages/playwright-core/src/server/fetch.ts
@@ -39,6 +39,7 @@ import { ProgressController } from './progress';
 import { Tracing } from './trace/recorder/tracing';
 import type * as types from './types';
 import type { HeadersArray, ProxySettings } from './types';
+import { kMaxCookieExpiresDateInSeconds } from './network';
 
 type FetchRequestOptions = {
   userAgent: string;
@@ -606,13 +607,25 @@ function parseCookie(header: string): channels.NetworkCookie | null {
     switch (name.toLowerCase()) {
       case 'expires':
         const expiresMs = (+new Date(value));
-        if (isFinite(expiresMs))
-          cookie.expires = expiresMs / 1000;
+        // https://datatracker.ietf.org/doc/html/rfc6265#section-5.2.1
+        if (isFinite(expiresMs)) {
+          if (expiresMs <= 0)
+            cookie.expires = 0;
+          else
+            cookie.expires = Math.min(expiresMs / 1000, kMaxCookieExpiresDateInSeconds);
+        }
         break;
       case 'max-age':
         const maxAgeSec = parseInt(value, 10);
-        if (isFinite(maxAgeSec))
-          cookie.expires = Date.now() / 1000 + maxAgeSec;
+        if (isFinite(maxAgeSec)) {
+          // From https://datatracker.ietf.org/doc/html/rfc6265#section-5.2.2
+          // If delta-seconds is less than or equal to zero (0), let expiry-time
+          // be the earliest representable date and time.
+          if (maxAgeSec <= 0)
+            cookie.expires = 0;
+          else
+            cookie.expires = Math.min(Date.now() / 1000 + maxAgeSec, kMaxCookieExpiresDateInSeconds);
+        }
         break;
       case 'domain':
         cookie.domain = value.toLocaleLowerCase() || '';
diff --git a/packages/playwright-core/src/server/firefox/ffBrowser.ts b/packages/playwright-core/src/server/firefox/ffBrowser.ts
index 9cb79034f9..d6d22b3eae 100644
--- a/packages/playwright-core/src/server/firefox/ffBrowser.ts
+++ b/packages/playwright-core/src/server/firefox/ffBrowser.ts
@@ -283,7 +283,7 @@ export class FFBrowserContext extends BrowserContext {
   async addCookies(cookies: channels.SetNetworkCookie[]) {
     const cc = network.rewriteCookies(cookies).map(c => ({
       ...c,
-      expires: c.expires && c.expires !== -1 ? c.expires : undefined,
+      expires: c.expires === -1 ? undefined : c.expires,
     }));
     await this._browser._connection.send('Browser.setCookies', { browserContextId: this._browserContextId, cookies: cc });
   }
diff --git a/packages/playwright-core/src/server/network.ts b/packages/playwright-core/src/server/network.ts
index 0ec0ea6efa..fdf0573ac3 100644
--- a/packages/playwright-core/src/server/network.ts
+++ b/packages/playwright-core/src/server/network.ts
@@ -52,7 +52,7 @@ export function filterCookies(cookies: channels.NetworkCookie[], urls: string[])
 // Rollover to 5-digit year:
 // 253402300799 == Fri, 31 Dec 9999 23:59:59 +0000 (UTC)
 // 253402300800 == Sat,  1 Jan 1000 00:00:00 +0000 (UTC)
-const kMaxCookieExpiresDateInSeconds = 253402300799;
+export const kMaxCookieExpiresDateInSeconds = 253402300799;
 
 export function rewriteCookies(cookies: channels.SetNetworkCookie[]): channels.SetNetworkCookie[] {
   return cookies.map(c => {
diff --git a/tests/library/browsercontext-fetch.spec.ts b/tests/library/browsercontext-fetch.spec.ts
index a44ab8a941..913c21c664 100644
--- a/tests/library/browsercontext-fetch.spec.ts
+++ b/tests/library/browsercontext-fetch.spec.ts
@@ -270,6 +270,43 @@ it('should not lose body while handling Set-Cookie header', async ({ context, se
   expect(await response.text()).toBe('text content');
 });
 
+it('should remove cookie with negative max-age', async ({ page, server }) => {
+  server.setRoute('/setcookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', ['a=v; max-age=100000', `b=v; max-age=100000`, 'c=v']);
+    res.end();
+  });
+  server.setRoute('/removecookie.html', (req, res) => {
+    const maxAge = -2 * Date.now();
+    res.setHeader('Set-Cookie', [`a=v; max-age=${maxAge}`, `b=v; max-age=-1`]);
+    res.end();
+  });
+  await page.request.get(`${server.PREFIX}/setcookie.html`);
+  await page.request.get(`${server.PREFIX}/removecookie.html`);
+  const [serverRequest] = await Promise.all([
+    server.waitForRequest('/empty.html'),
+    page.request.get(server.EMPTY_PAGE)
+  ]);
+  expect(serverRequest.headers.cookie).toBe('c=v');
+});
+
+it('should remove cookie with expires far in the past', async ({ page, server }) => {
+  server.setRoute('/setcookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', ['a=v; max-age=1000000']);
+    res.end();
+  });
+  server.setRoute('/removecookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', [`a=v; expires=Wed, 01 Jan 1000 00:00:00 GMT`]);
+    res.end();
+  });
+  await page.request.get(`${server.PREFIX}/setcookie.html`);
+  await page.request.get(`${server.PREFIX}/removecookie.html`);
+  const [serverRequest] = await Promise.all([
+    server.waitForRequest('/empty.html'),
+    page.request.get(server.EMPTY_PAGE)
+  ]);
+  expect(serverRequest.headers.cookie).toBeFalsy();
+});
+
 it('should handle cookies on redirects', async ({ context, server, browserName, isWindows }) => {
   server.setRoute('/redirect1', (req, res) => {
     res.setHeader('Set-Cookie', 'r1=v1;SameSite=Lax');
diff --git a/tests/library/global-fetch-cookie.spec.ts b/tests/library/global-fetch-cookie.spec.ts
index 25532d2f91..374d6eef90 100644
--- a/tests/library/global-fetch-cookie.spec.ts
+++ b/tests/library/global-fetch-cookie.spec.ts
@@ -168,6 +168,43 @@ it('should remove expired cookies', async ({ request, server }) => {
   expect(serverRequest.headers.cookie).toBe('a=v');
 });
 
+it('should remove cookie with negative max-age', async ({ request, server }) => {
+  server.setRoute('/setcookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', ['a=v; max-age=100000', `b=v; max-age=100000`, 'c=v']);
+    res.end();
+  });
+  server.setRoute('/removecookie.html', (req, res) => {
+    const maxAge = -2 * Date.now();
+    res.setHeader('Set-Cookie', [`a=v; max-age=${maxAge}`, `b=v; max-age=-1`]);
+    res.end();
+  });
+  await request.get(`${server.PREFIX}/setcookie.html`);
+  await request.get(`${server.PREFIX}/removecookie.html`);
+  const [serverRequest] = await Promise.all([
+    server.waitForRequest('/empty.html'),
+    request.get(server.EMPTY_PAGE)
+  ]);
+  expect(serverRequest.headers.cookie).toBe('c=v');
+});
+
+it('should remove cookie with expires far in the past', async ({ request, server }) => {
+  server.setRoute('/setcookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', ['a=v; max-age=1000000']);
+    res.end();
+  });
+  server.setRoute('/removecookie.html', (req, res) => {
+    res.setHeader('Set-Cookie', [`a=v; expires=1 Jan 1000 00:00:00 +0000 (UTC)`]);
+    res.end();
+  });
+  await request.get(`${server.PREFIX}/setcookie.html`);
+  await request.get(`${server.PREFIX}/removecookie.html`);
+  const [serverRequest] = await Promise.all([
+    server.waitForRequest('/empty.html'),
+    request.get(server.EMPTY_PAGE)
+  ]);
+  expect(serverRequest.headers.cookie).toBeFalsy();
+});
+
 it('should store cookie from Set-Cookie header even if it contains equal signs', async ({ request, server }) => {
   it.info().annotations.push({ type: 'issue', description: 'https://github.com/microsoft/playwright/issues/11612' });