Fera only has 1 cookie that is (almost) required:
*Almost because it depends on how your shopper(s) interacts on your site*
Type: Functionality (Session)
Description: Unique, secure session token generated for each shopper so that when they submit a review we have a way to link the review to the current person who is shopping even if they don't log-in. This also allows customers to edit their reviews right after they've submitted them, or resume a session managing their reviews/profile.
YES if submitting reviews,
NO otherwise. That is, anonymous shoppers can delete this cookie.
Effect of Removing: Customer won't be able to submit or edit their own reviews - only view them.