var w = window.open(window.location.href);
setInterval(function(){w.window.location.reload()},10000)
this will duplicate and reload a tab every 10 second (10000 milisecond), change it as required
put above code in a book marklet converter like https://mrcoles.com/bookmarklet/
here is the bookmarklet for it, add this to bookmark panel
javascript:(function()%7Bvar%20w%20%3D%20window.open(window.location.href)%3BsetInterval(function()%7Bw.window.location.reload()%7D%2C10000)%7D)()
javascript:(function()%7Bvar%20w%20%3D%20window.open(window.location.href)%3BsetInterval(function()%7Bw.window.location.reload()%7D%2C120000)%7D)()