While assuming absolutely zero bad will on your part, I would nevertheless find it fair if you were legally on the hook for whatever happened after the sale, unless you could prove that you provided reasonable means for the users of your extension to perform their due diligence on the new owner of the extension.
This is of course easy to say in hindsight, and is absolutely a requirement that should be enforced by the extension appstore, not by individual contributors such as yourself.
This is of course easy to say in hindsight, and is absolutely a requirement that should be enforced by the extension appstore, not by individual contributors such as yourself.