Is it possible to setup automatic notifications when someone answers a question on questions or answers that you have voted on in the past?
Sometimes, I want to see what answers come up in the future on answers or questions I voted on.
This is not possible using the functionality provided by SE. The best you can do is manually check the favorites tab in your profile to check if any of your favorite questions have received new answers since you last visited the tab. I agree that it would be nice to receive a notification in my inbox when certain questions receive a new answer or a post is edited, though I would want this to be an opt-in feature (on a per post basis) so that I don't receive too many notifications.
Although this feature is not provided by SE, you may be interested in a feature provided by the Stack Overflow Extras (SOX) userscript; one of its features allows you to mark a post so that you are notified when it is edited. The feature was inspired by the MSE post Allow me to get notifications on specific down-voted questions, though it's not limited to questions that were downvoted:
You don't actually have to use this in conjunction with downvotes -- use it as an alternative 'favourite' feature for notifications on any edits
This isn't possible with current SE functionality. Related feature requests on main meta: