RegisteredUserScript object is returned by a call to
userScripts.register() and represents the user scripts registered in that call.
The object defines a single method,
unregister(), which is used to unregister the user scripts.
Note: If this object is destroyed (for example because it goes out of scope) then the associated scripts will be unregistered automatically, so you should keep a reference to this object for as long as you want the user scripts to stay registered.
Unregisters the user scripts represented by this object.
BCD tables only load in the browser