Filter out Useful Links.

allthelinks.js

x = document.getElementsByTagName("a")
arr = [].slice.call(x);
y = arr.map(function(z){ 
  return z.href;
});

t = y.filter(function(x){
  a =  x.indexOf("mp4") != -1;
  b =  x.indexOf("srt") != -1;
  c =  x.indexOf("pdf") != -1;
  return a || b || c;
});


/*
t.map(function(z){
  console.log(z); 
});

*/

var p = document.createElement('div');
p.style.cssText = 'position:absolute; z-index: 1000; background: white;width:100%; height:100%; left:0px; top:0px;'
for (var i=0; i<t.length; i++){
  p.innerHTML += '<a href="'+t[i]+'">'+t[i]+'</a><br/>\n';
}
document.body.innerHTML = "";
document.body.appendChild(p);