[py] Fixing tests for Firefox options to capabilities converter

Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/SeleniumHQ/selenium
Cr-Mirrored-Commit: aa2c09afcff00648f11816224afa4df88b4f2c29
diff --git a/test/selenium/webdriver/marionette/mn_options_tests.py b/test/selenium/webdriver/marionette/mn_options_tests.py
index 33e988b..34af128 100644
--- a/test/selenium/webdriver/marionette/mn_options_tests.py
+++ b/test/selenium/webdriver/marionette/mn_options_tests.py
@@ -100,7 +100,9 @@
 
     def test_to_capabilities(self):
         opts = Options()
-        assert opts.to_capabilities() == DesiredCapabilities.FIREFOX
+        firefox_caps = DesiredCapabilities.INTERNETEXPLORER.copy()
+        firefox_caps.update({"pageLoadStrategy": "normal"})
+        assert opts.to_capabilities() == firefox_caps
 
         profile = FirefoxProfile()
         opts.profile = profile