id-linker.user.js

// ==UserScript==
// @name           ID Linker
// @namespace      http://geoffstokes.net/
// @include        *
// ==/UserScript==
(function () {
	// TODO: Search up the DOM tree for the nearest ID.
	Array.prototype.slice.call(document.querySelectorAll('[id]')).forEach(function (element) {
		element.addEventListener('click', function (event) {
			if (event.button === 1 && event.altKey) {
				window.location.hash = "#" + element.id;
				event.preventDefault();
				event.stopPropagation();
			}
		});
	});
}());