sS hjs_sendWindowVisibilityToWebSocket() {
  var isTabActive;
  
  wsOnOpen(function() {
    if (wsReady) ws.send(JSON.stringify({"isTabActive": isTabActive}));
  });

  window.onfocus = function () { 
    isTabActive = true; 
    if (wsReady) ws.send(JSON.stringify({"isTabActive": isTabActive}));
  }; 

  window.onblur = function () { 
    isTabActive = false; 
    if (wsReady) ws.send(JSON.stringify({"isTabActive": isTabActive}));
  }; 
\