None of those are supposed to stay on the background (specially not browsers, which are sandboxes for untrusted apps nowadays). But if I click X on my email cl

None of those are supposed to stay on the background (specially not browsers, which are sandboxes for untrusted apps nowadays). But if I click X on my email client, it keeps receiving email; if I click X on my torrent app or JDownloader, they keep downloading; if I click X on Steam, it keeps updating my games; and if I click X on a chat application, it keeps receiving messages and, yes, usually keeps voice chat open. And BTW, browser tabs sadly do stay open in a twisted way: notifications, often malicious for the kind of users that accept the prompts without reading.