An enum that specifies what to do when a URL opened through an
OpenLink is closed.
When a link is opened, the client either forgets about it or waits until the window is closed.
The implementation depends on the client platform capabilities.
OnClose may cause
OpenAs to be ignored; if the client platform cannot support both selected values together,
OnClose takes precedence.
|Do nothing on close. Default.|
|Reload the add-on on closing the URL.|