diff --git a/securedrop/tests/functional/web_drivers.py b/securedrop/tests/functional/web_drivers.py
index bddd4a5239..7386c75978 100644
--- a/securedrop/tests/functional/web_drivers.py
+++ b/securedrop/tests/functional/web_drivers.py
@@ -13,6 +13,7 @@
 from selenium.webdriver.firefox.webdriver import WebDriver
 from selenium.webdriver.remote.remote_connection import LOGGER
 from tbselenium.tbdriver import TorBrowserDriver
+from tbselenium.utils import set_tbb_pref
 
 _LOGFILE_PATH = abspath(join(dirname(realpath(__file__)), "../log/driver.log"))
 _FIREFOX_PATH = "/usr/bin/firefox/firefox"
@@ -54,8 +55,6 @@ def _create_torbrowser_driver(
         "network.proxy.no_proxies_on": "127.0.0.1",
         "browser.privatebrowsing.autostart": False,
     }
-    if accept_languages is not None:
-        pref_dict["intl.accept_languages"] = accept_languages
 
     Path(_TBB_PATH).mkdir(parents=True, exist_ok=True)
     torbrowser_driver = None
@@ -67,6 +66,12 @@ def _create_torbrowser_driver(
                 pref_dict=pref_dict,
                 tbb_logfile_path=_LOGFILE_PATH,
             )
+            if accept_languages is not None:
+                # privacy.spoof_english per
+                # <https://github.com/arkenfox/user.js/issues/1827#issuecomment-2075819482>.
+                set_tbb_pref(driver, "privacy.spoof_english", 1)
+                set_tbb_pref(torbrowser_driver, "intl.accept_languages", accept_languages)
+
             logging.info("Created Tor Browser web driver")
             torbrowser_driver.set_window_position(0, 0)
             torbrowser_driver.set_window_size(*_BROWSER_SIZE)