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.
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