Maximizes ARD/ZDF live TV player without entering fullscreen; allows window switching and better performance for watching e.g. football world championship in the background. Copy code into a bookmark and click the bookmark to toggle the player size on http://www.daserste.de/live/index.html and https://www.zdf.de/live-tv#/beitrag/livevideo/182260…

ard-zdf-live-tv-stream-maximize-bookmarklet.js

javascript:(function () { 
  if (!document.getElementById('sun-maxplayer')) {
    var style = document.createElement('style');
    style.type = 'text/css';
    style.id = 'sun-maxplayer';
    style.appendChild(document.createTextNode('
/* ZDF */ 
html .page #skip-main .b-playerbox { width: 100vw; z-index: 999999999; transform: translate3d(-341.9px, 0px, 0px); } 
html .page .scroll-arrow { display: none; } 
html .b-header { position: static; } 
/* ARD */ 
html body #content div.ardplayer, 
html body .video-fmt-container iframe { position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 999999999; width: 100vw; height: 100vh; }
/* #liveCon .av-playerContainer, .av-playerContainer video { width: 100vw !important; height: 100vh !important; border: 0; } 
.wrapper, .sectionA { width: auto; margin: 0; }*/
'));
    document.head.appendChild(style);
    style.disabled = true;
  }
  var toggle = document.getElementById('sun-maxplayer');
  toggle.disabled = !toggle.disabled;
}());