Open links in current tab

Open links in current tab regardless of _target or site's preferences. Ctrl-click: background tab, Ctrl-Shift-click: foreground tab, Shift-click: new window, Alt-click: force open in current tab

As of 2016-10-22. See the latest version.

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// ==UserScript==
// @name          Open links in current tab
// @author        wOxxOm
// @description   Open links in current tab regardless of _target or site's preferences. Ctrl-click: background tab, Ctrl-Shift-click: foreground tab, Shift-click: new window, Alt-click: force open in current tab
// @namespace     http://target._blank.is.retarded
// @version       2.2.0
// @include       *
// @run-at        document-start
// @grant         GM_openInTab
// ==/UserScript==

var suppressing, clickedElement;
window.addEventListener('mousedown', function(e) {
	clickedElement = e.target;
}, true);

window.addEventListener('mouseup', function(e) {
	if (e.button > 1 || e.target != clickedElement)
		return;
	var link = pierceShadow(e);
	if (!link || (link.getAttribute('href') || '').match(/^(javascript|#|$)/))
		return;
	var b = e.button, c = e.ctrlKey, a = e.altKey, s = e.shiftKey, m = e.metaKey;
	if (!a && link.target != '_blank')
		return blockWindowOpen({observer: freezeTarget(link)});
	if (!b && !c && !s && !m && (link.href.replace(/#.*/, '') != location.href.replace(/#.*/, '') || a || link.target == '_blank'))
		location.href = link.href;
	else if (b == 1 || c && !a && !m)
		GM_openInTab(link.href, !s);
	else if (window.chrome && !b && s && !c && !a && !m)
		link.cloneNode().dispatchEvent(new MouseEvent('click', {shiftKey: true}));
	else
		return;
	suppressing = true;
	prevent(e);
}, true);

window.addEventListener('click', prevent, true);
window.addEventListener('auxclick', prevent, true);

function prevent(e) {
	if (!suppressing)
		return;
	e.preventDefault();
	e.stopPropagation();
	e.stopImmediatePropagation();
	setTimeout(function() {
		suppressing = false;
	}, 50);
}

function freezeTarget(link) {
	var observer = new MutationObserver(function(mutations) {
		if (link.target == '_blank') {
			link.removeAttribute('target');
			console.log('[Open links in current tab] prevented dynamic target=_blank for', link.href);
		}
	});
	observer.observe(link, {attributes:true, attributeFilter:['target'], characterData:true});
	return observer;
}

function blockWindowOpen(params) {
	var _open = unsafeWindow.open;
	var timeout = setTimeout(function() {
		unsafeWindow.open = _open;
		if (params && params.observer)
			params.observer.disconnect();
	}, 50);
	unsafeWindow.open = exportFunction(function(url, name, features) {
		if (!features) {
			console.log('[Open links in current tab] prevented window.open for', url);
			location.href = link.href;
		} else
			_open(url, name, features);
		unsafeWindow.open = _open;
		clearTimeout(timeout);
	}, unsafeWindow);
}

function pierceShadow(e) {
	var el = e.target;
	while (el.shadowRoot)
		el = el.shadowRoot.elementFromPoint(e.clientX, e.clientY);
	return el.closest('a');
}