Fixed video tests for firefox

cms/djangoapps/contentstore/features/common.py

@@ -234,7 +234,7 @@ def i_created_video_alpha(step):
 def i_enabled_the_advanced_module(step, module):
     step.given('I have opened a new course section in Studio')
     world.css_click('.nav-course-settings')
-    world.css_click('.nav-course-settings-advanced')
+    world.css_click('.nav-course-settings-advanced a')
     type_in_codemirror(0, '["%s"]' % module)
     press_the_notification_button(step, 'Save')
 

cms/djangoapps/contentstore/features/video.feature

@@ -23,6 +23,7 @@ Feature: Video Component
     And I have toggled captions
     Then when I view the video it does show the captions
 
+  #Video Alpha Features will work in Firefox only when Firefox is the active window
   Scenario: Autoplay is disabled in Studio for Video Alpha
     Given I have created a Video Alpha component
     Then when I view the videoalpha it does not have autoplay enabled