GitHub diff with whitespace ignored

github-diff-with-whitespace-ignored.js

javascript:(function(){
  if (document.location.host === 'github.com') {
    var query = document.location.search;
    if (query === '') {
      document.location = document.location + '?w=1';
    } else if (query.indexOf('w=') === -1){
      document.location = document.location + '&w=1';
    } else {
      var index = query.indexOf('w=');
      var arr = query.substr(index).split('&');
      arr[0] = 'w=1';
      var newQuery = query.slice(0,index) + arr.join('&');
      var newUrl = document.location.origin + document.location.pathname + newQuery;
      document.location = newUrl;
    } 
  }
})();