Feedly Tweak - Open feed item in background by pressing 'v'

feedly.user.js

// ==UserScript==
// @name           Feedly Tweak - Open feed item in background by pressing 'v'
// @namespace      http://micbase.com/feedly-tweak-open-item-background-tab-firefox
// @description    Feedly Tweak - Open feed item in background by pressing 'v'
// @include        http*://feedly.com/*
// @grant          GM.openInTab
// ==/UserScript==

var x;
var link;

document.addEventListener('keypress', function(event) {
    //if user press 'v' key, then open links in new tab in background
    if (event.which == 118) {

        x = document.getElementsByClassName('entry selected');

      //if no feed item selected, exit
        if (x == null){
            return;
        }
        link = x[0].getAttribute('data-alternate-link');

        event.stopPropagation();
        event.preventDefault();
        GM.openInTab(link, true);
    }
}, true);

Hey,
This script is not working for me (FF57).
Opens tabs in foreground only.
Is it outdated?
Thanks!

Did you ever get this working @vvvlad?

@henricook I did find some script that worked, or modified this one, but don't remember which.
Later switched to inoreader and never had this type of a problem anymore.
Sorry couldn't help more with this...

Thanks for the script! It works for me. Chrome + Tampermonkey.