fix(browser): preserve default Chrome arg order

browser_use/browser/profile.py

@@ -907,7 +907,8 @@ class BrowserProfile(BrowserConnectArgs, BrowserLaunchPersistentContextArgs, Bro
 		"""Get the list of all Chrome CLI launch args for this profile (compiled from defaults, user-provided, and system-specific)."""
 
 		if isinstance(self.ignore_default_args, list):
-			default_args = set(CHROME_DEFAULT_ARGS) - set(self.ignore_default_args)
+			ignored_default_args = set(self.ignore_default_args)
+			default_args = [arg for arg in CHROME_DEFAULT_ARGS if arg not in ignored_default_args]
 		elif self.ignore_default_args is True:
 			default_args = []
 		elif not self.ignore_default_args:

tests/ci/test_profile_args.py

@@ -0,0 +1,32 @@
+from browser_use.browser.profile import CHROME_DEFAULT_ARGS, BrowserProfile
+
+
+def test_get_args_keeps_default_order_when_ignoring_default_args(tmp_path):
+	profile = BrowserProfile(
+		user_data_dir=tmp_path,
+		ignore_default_args=['--disable-popup-blocking', '--no-default-browser-check'],
+		enable_default_extensions=False,
+	)
+
+	args = profile.get_args()
+
+	expected_defaults = [
+		arg for arg in CHROME_DEFAULT_ARGS if arg not in {'--disable-popup-blocking', '--no-default-browser-check'}
+	]
+	actual_defaults = [arg for arg in args if arg in CHROME_DEFAULT_ARGS]
+
+	assert actual_defaults == expected_defaults
+	assert '--disable-popup-blocking' not in args
+	assert '--no-default-browser-check' not in args
+
+
+def test_get_args_keeps_default_order_with_default_ignored_args(tmp_path):
+	profile = BrowserProfile(user_data_dir=tmp_path, enable_default_extensions=False)
+
+	args = profile.get_args()
+
+	ignored_default_args = profile.ignore_default_args if isinstance(profile.ignore_default_args, list) else []
+	expected_defaults = [arg for arg in CHROME_DEFAULT_ARGS if arg not in ignored_default_args]
+	actual_defaults = [arg for arg in args if arg in CHROME_DEFAULT_ARGS]
+
+	assert actual_defaults == expected_defaults