fix: replace headless property in browser options class (#4642)

* fix: replace headless property in Firefox options class

Author: emmanuel-ferdman

acceptance_tests/affiliate_cookie_tests.py

@@ -36,7 +36,7 @@ class AffiliateCookieTestMixin:
     def setUp(self):
         super().setUp()
         opts = Options()
-        opts.headless = True
+        opts.add_argument('--headless')
         self.browser = webdriver.Firefox(opts)
         self.cookie_name = AFFILIATE_COOKIE_NAME
         self.cookie_domain = COOKIE_DOMAIN

course_discovery/apps/course_metadata/tests/test_admin.py

@@ -295,7 +295,7 @@ class ProgramAdminFunctionalTests(SiteMixin, LiveServerTestCase):
     def setUpClass(cls):
         super().setUpClass()
         opts = Options()
-        opts.headless = True
+        opts.add_argument('--headless')
         cls.browser = webdriver.Firefox(options=opts)
         cls.browser.set_window_size(1024, 768)
 

course_discovery/apps/tagging/tests/test_views.py

@@ -83,7 +83,7 @@ class CourseTaggingDetailViewJSTests(SiteMixin, LiveServerTestCase):
     def setUpClass(cls):
         super().setUpClass()
         firefox_options = Options()
-        firefox_options.headless = True
+        firefox_options.add_argument('--headless')
         cls.driver = webdriver.Firefox(options=firefox_options)
         cls.driver.implicitly_wait(10)