Added comments to the two flakey features on firefox

cms/djangoapps/contentstore/features/advanced-settings.feature

@@ -40,6 +40,7 @@ Feature: Advanced (manual) course policy
     And I reload the page
     Then the policy key value is unchanged
 
+  #This feature will work in Firefox only when Firefox is the active window
   Scenario: Test automatic quoting of non-JSON values
     Given I am on the Advanced Course Settings page in Studio
     When I create a non-JSON value not in quotes

cms/djangoapps/contentstore/features/problem-editor.feature

@@ -68,6 +68,7 @@ Feature: Problem Editor
     When I edit and select Settings
     Then Edit High Level Source is visible
 
+  #This feature will work in Firefox only when Firefox is the active window
   Scenario: High Level source is persisted for LaTeX problem (bug STUD-280)
     Given I have created a LaTeX Problem
     When I edit and compile the High Level Source