diff --git a/docs/guides/system-requirements.md b/docs/guides/system-requirements.md
index ffa4e50cf5e4d..1f0e9c6563d07 100644
--- a/docs/guides/system-requirements.md
+++ b/docs/guides/system-requirements.md
@@ -18,3 +18,4 @@
 - Firefox browser system requirements:
 
   - https://www.mozilla.org/en-US/firefox/system-requirements/
+  - The `xz` utility is required to unpack Firefox versions 135+ for Linux.
diff --git a/packages/browsers/src/browser-data/firefox.ts b/packages/browsers/src/browser-data/firefox.ts
index d5d4eb78302a6..afcf755e27d00 100644
--- a/packages/browsers/src/browser-data/firefox.ts
+++ b/packages/browsers/src/browser-data/firefox.ts
@@ -11,10 +11,15 @@ import {getJSON} from '../httpUtil.js';
 
 import {BrowserPlatform, type ProfileOptions} from './types.js';
 
+function getFormat(buildId: string): string {
+  const majorVersion = Number(buildId.split('.').shift()!);
+  return majorVersion >= 135 ? 'xz' : 'bz2';
+}
+
 function archiveNightly(platform: BrowserPlatform, buildId: string): string {
   switch (platform) {
     case BrowserPlatform.LINUX:
-      return `firefox-${buildId}.en-US.${platform}-x86_64.tar.bz2`;
+      return `firefox-${buildId}.en-US.${platform}-x86_64.tar.${getFormat(buildId)}`;
     case BrowserPlatform.MAC_ARM:
     case BrowserPlatform.MAC:
       return `firefox-${buildId}.en-US.mac.dmg`;
@@ -27,7 +32,7 @@ function archiveNightly(platform: BrowserPlatform, buildId: string): string {
 function archive(platform: BrowserPlatform, buildId: string): string {
   switch (platform) {
     case BrowserPlatform.LINUX:
-      return `firefox-${buildId}.tar.bz2`;
+      return `firefox-${buildId}.tar.${getFormat(buildId)}`;
     case BrowserPlatform.MAC_ARM:
     case BrowserPlatform.MAC:
       return `Firefox ${buildId}.dmg`;
diff --git a/packages/browsers/src/fileUtil.ts b/packages/browsers/src/fileUtil.ts
index 15ff3e56dd3c6..e28328f5f0e5a 100644
--- a/packages/browsers/src/fileUtil.ts
+++ b/packages/browsers/src/fileUtil.ts
@@ -4,10 +4,11 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import {spawnSync} from 'child_process';
+import {spawnSync, spawn} from 'child_process';
 import {createReadStream} from 'fs';
 import {mkdir, readdir} from 'fs/promises';
 import * as path from 'path';
+import {Stream} from 'stream';
 
 import extractZip from 'extract-zip';
 import tar from 'tar-fs';
@@ -39,6 +40,8 @@ export async function unpackArchive(
         `Failed to extract ${archivePath} to ${folderPath}: ${result.output}`,
       );
     }
+  } else if (archivePath.endsWith('.tar.xz')) {
+    await extractTarXz(archivePath, folderPath);
   } else {
     throw new Error(`Unsupported archive format: ${archivePath}`);
   }
@@ -57,6 +60,63 @@ function extractTar(tarPath: string, folderPath: string): Promise<void> {
   });
 }
 
+/**
+ * @internal
+ */
+function createXzStream() {
+  const child = spawn('xz', ['-d']);
+  const stream = new Stream.Transform({
+    transform(chunk, encoding, callback) {
+      if (!child.stdin.write(chunk, encoding)) {
+        child.stdin.once('drain', callback);
+      } else {
+        callback();
+      }
+    },
+
+    flush(callback) {
+      if (child.stdout.destroyed) {
+        callback();
+      } else {
+        child.stdin.end();
+        child.stdout.on('close', callback);
+      }
+    },
+  });
+
+  child.stdin.on('error', e => {
+    if ('code' in e && e.code === 'EPIPE') {
+      // finished before reading the file finished (i.e. head)
+      stream.emit('end');
+    } else {
+      stream.destroy(e);
+    }
+  });
+
+  child.stdout
+    .on('data', data => {
+      return stream.push(data);
+    })
+    .on('error', e => {
+      return stream.destroy(e);
+    });
+
+  return stream;
+}
+
+/**
+ * @internal
+ */
+function extractTarXz(tarPath: string, folderPath: string): Promise<void> {
+  return new Promise((fulfill, reject) => {
+    const tarStream = tar.extract(folderPath);
+    tarStream.on('error', reject);
+    tarStream.on('finish', fulfill);
+    const readStream = createReadStream(tarPath);
+    readStream.pipe(createXzStream()).pipe(tarStream);
+  });
+}
+
 /**
  * @internal
  */
diff --git a/packages/browsers/test/src/firefox/firefox-data.spec.ts b/packages/browsers/test/src/firefox/firefox-data.spec.ts
index 6c58635f92af6..fbae5b270ac2c 100644
--- a/packages/browsers/test/src/firefox/firefox-data.spec.ts
+++ b/packages/browsers/test/src/firefox/firefox-data.spec.ts
@@ -23,6 +23,14 @@ describe('Firefox', () => {
       resolveDownloadUrl(BrowserPlatform.LINUX, '111.0a1'),
       'https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-111.0a1.en-US.linux-x86_64.tar.bz2',
     );
+    assert.strictEqual(
+      resolveDownloadUrl(BrowserPlatform.LINUX, '135.0a1'),
+      'https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-135.0a1.en-US.linux-x86_64.tar.xz',
+    );
+    assert.strictEqual(
+      resolveDownloadUrl(BrowserPlatform.LINUX, '136.0a1'),
+      'https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-136.0a1.en-US.linux-x86_64.tar.xz',
+    );
     assert.strictEqual(
       resolveDownloadUrl(BrowserPlatform.MAC, '111.0a1'),
       'https://archive.mozilla.org/pub/firefox/nightly/latest-mozilla-central/firefox-111.0a1.en-US.mac.dmg',