FS.shutdown() can be invoked immediately after the FullStory snippet
is executed. It's idempotent, meaning that it just quietly does nothing if you call it multiple times after the first invocation.
Call FS.restart() to begin recording again.
FS.shutdown() is invoked, FullStory will no longer receive data from the user's device. When running FullStory in a web browser,
recording begins automatically once the page is loaded from the server;
FS.shutdown() must be called each time after a page is loaded.