pollution.js

(function(global, undefined) {

   var MAXDEPTH = 10;
   // name, prefix, depth
   var print = function(n, p, d) {
     if (d > MAXDEPTH) {
       return new Error('MAXDEPTH exceeded');
     }
     console.log(n, p, d);
     var b = p[n];
     // Allow base indenting based on the depth
     var response = '\n' + 
       (new Array(d).join('  ')) +
       n + 
       ' (' + (typeof b) + ')';

     // Could apply hasOwnProperty filter 
     // This doesn't account for functions with child properties
     // Don't iterate through the lenght of the string 
     if (typeof b !== 'string') {
       for (var k in b) {
         if (b.hasOwnProperty(k)) {
           response += print(k, b, d + 1);
         }
       }        
     }
     return response; 
   };

   var body = document.getElementsByTagName('body')[0];

   // Establish a baseline of an unpolluted namespace in a new frame
   var frame = document.createElement('frame');
   frame.src = 'about:blank';
   body.appendChild(frame);
   var clean = parent.frames[0];
   var output = '';

   for (var p in window) {
     if (typeof clean.window[p] === 'undefined') {
       if (typeof window[p] !== 'undefined') {
         output += print(p, window, 1);
       }
     }
   };

   var report = document.createElement('pre');
   report.innerHTML = output;
   body.appendChild(report);

 }(this));