Websites that rely on always having the latest information on the front page can include special code that automatically refreshes or reloads the page after a set amount of time. You can disable this function from your browser settings if you find it annoying or disorienting when frequenting sites that auto-refresh. In order to allow this feature again, you must enable it either from the Firefox general options tab or the configuration page. With the use of add-ons or Web services, this feature can also be enabled on Web pages that do not support it natively. Writer Bio

How to Allow Web Pages to Auto refresh or Reload in Firefox - 41