diff --git a/scripts/lib/vendor/bird-search/lib/cookies.js b/scripts/lib/vendor/bird-search/lib/cookies.js
index 636fc82..eb0d85b 100644
--- a/scripts/lib/vendor/bird-search/lib/cookies.js
+++ b/scripts/lib/vendor/bird-search/lib/cookies.js
@@ -117,14 +117,21 @@ async function readTwitterCookiesFromBrowser(options) {
     }
     return { cookies: out, warnings };
 }
+async function extractCookiesFromBrowser(options) {
+    const { getCookies } = await loadSweetCookie();
+    return readTwitterCookiesFromBrowser({
+        getCookies,
+        ...options,
+    });
+}
 export async function extractCookiesFromSafari() {
-    return readTwitterCookiesFromBrowser({ source: 'safari' });
+    return extractCookiesFromBrowser({ source: 'safari' });
 }
 export async function extractCookiesFromChrome(profile) {
-    return readTwitterCookiesFromBrowser({ source: 'chrome', chromeProfile: profile });
+    return extractCookiesFromBrowser({ source: 'chrome', chromeProfile: profile });
 }
 export async function extractCookiesFromFirefox(profile) {
-    return readTwitterCookiesFromBrowser({ source: 'firefox', firefoxProfile: profile });
+    return extractCookiesFromBrowser({ source: 'firefox', firefoxProfile: profile });
 }
 /**
  * Resolve Twitter credentials from multiple sources.
diff --git a/tests/test_bird_x.py b/tests/test_bird_x.py
index 20ad216..f85708c 100644
--- a/tests/test_bird_x.py
+++ b/tests/test_bird_x.py
@@ -3,6 +3,7 @@ import os
 import shutil
 import subprocess
 import sys
+import textwrap
 import unittest
 from pathlib import Path
 
@@ -73,6 +74,97 @@ class TestVendoredBirdRuntime(unittest.TestCase):
         self.assertTrue(payload["warnings"])
         self.assertIn("Missing auth_token", " ".join(payload["warnings"]))
 
+    def test_browser_cookie_helpers_lazy_load_sweet_cookie(self):
+        sweet_cookie_dir = (
+            REPO_ROOT
+            / "scripts"
+            / "lib"
+            / "vendor"
+            / "bird-search"
+            / "lib"
+            / "node_modules"
+            / "@steipete"
+            / "sweet-cookie"
+        )
+        if sweet_cookie_dir.exists():
+            self.skipTest("vendored sweet-cookie test stub already exists")
+
+        sweet_cookie_dir.mkdir(parents=True)
+        (sweet_cookie_dir / "package.json").write_text(
+            json.dumps(
+                {
+                    "name": "@steipete/sweet-cookie",
+                    "type": "module",
+                    "exports": "./index.js",
+                }
+            ),
+            encoding="utf-8",
+        )
+        (sweet_cookie_dir / "index.js").write_text(
+            textwrap.dedent(
+                """
+                export async function getCookies(options) {
+                  const browser = options.browsers?.[0] ?? "unknown";
+                  return {
+                    cookies: [
+                      { name: "auth_token", value: `${browser}-auth`, domain: "x.com" },
+                      { name: "ct0", value: `${browser}-ct0`, domain: "x.com" },
+                    ],
+                    warnings: [],
+                  };
+                }
+                """
+            ),
+            encoding="utf-8",
+        )
+
+        try:
+            result = subprocess.run(
+                [
+                    "node",
+                    "--input-type=module",
+                    "-e",
+                    textwrap.dedent(
+                        """
+                        import {
+                          extractCookiesFromSafari,
+                          extractCookiesFromChrome,
+                          extractCookiesFromFirefox,
+                        } from "./scripts/lib/vendor/bird-search/lib/cookies.js";
+
+                        const payload = await Promise.all([
+                          extractCookiesFromSafari(),
+                          extractCookiesFromChrome("Profile 1"),
+                          extractCookiesFromFirefox("default-release"),
+                        ]);
+                        process.stdout.write(JSON.stringify(payload));
+                        """
+                    ),
+                ],
+                cwd=REPO_ROOT,
+                capture_output=True,
+                text=True,
+                check=False,
+            )
+
+            self.assertEqual(0, result.returncode, result.stderr)
+            payload = json.loads(result.stdout)
+            self.assertEqual("Safari", payload[0]["cookies"]["source"])
+            self.assertEqual('Chrome profile "Profile 1"', payload[1]["cookies"]["source"])
+            self.assertEqual(
+                'Firefox profile "default-release"', payload[2]["cookies"]["source"]
+            )
+            self.assertEqual("safari-auth", payload[0]["cookies"]["authToken"])
+            self.assertEqual("chrome-auth", payload[1]["cookies"]["authToken"])
+            self.assertEqual("firefox-auth", payload[2]["cookies"]["authToken"])
+        finally:
+            shutil.rmtree(sweet_cookie_dir, ignore_errors=True)
+            for path in [sweet_cookie_dir.parent, sweet_cookie_dir.parent.parent]:
+                try:
+                    path.rmdir()
+                except OSError:
+                    pass
+
     def test_none_likes_when_missing(self):
         tweets = [
             {