userscript.js

// ==UserScript==
// @name           Open Feedly in Background
// @author         toru hamaguchi
// @namespace      https://gist.github.com/toru-hamaguchi/9916038#file-userscript-js
// @description    Open Feedly feed item in background tab.
// @license        Creative Commons Attribution License
// @version        0.1
// @include        http*://feedly.com/*
// @compatible     Greasemonkey
// ==/UserScript==

/*
 * This file is a Greasemonkey user script. To install it, you need
 * the Firefox plugin "Greasemonkey" (URL: http://greasemonkey.mozdev.org/)
 * After you installed the extension, restart Firefox and revisit
 * this script. Now you will see a new menu item "Install User Script"
 * in your tools menu.
 *
 * To uninstall this script, go to your "Tools" menu and select
 * "Manage User Scripts", then select this script from the list
 * and click uninstall :-)
 *
 * Creative Commons Attribution License (--> or Public Domain)
 * http://creativecommons.org/licenses/by/2.5/
*/

(function() {

	const TRIGGER_KEY = 59;	// ";"

	document.addEventListener('keypress', function(e) {
		var el;

		if ((!e.altKey && !e.ctrlKey) && e.which === TRIGGER_KEY) {
			el = document.querySelector('.selectedEntry a.title');
			if (el === null){
					return;
			}
			e.stopPropagation();
			e.preventDefault();
			GM_openInTab(el.href);
		}
	}, true);

}());