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JavaScript

/*
	Arr Sort for Browser List
  
  Am checking for ints here, if they are floats than you need to change
  the regex accordingly.
*/

var normalTest = ['53 beta', '52 dev', '51', '50', '49', '48', '47', '46'];
var auroraTest = ['53 aurora', '52 beta', '51', '50', '49', '48', '47', '46'];
var randomTest = ['53 beta', '52', '51', '50', '49', '48', '47', '46'];

function browserSort(arr) {
	var intPos;
  for(var i = 0, l = arr.length; i < l; i++) {
  	//Get the first string arr item with only integer
    if(/^\d+$/.test(arr[i])) {
      arr[i] = arr[i] + ' latest'; // rename the first int pos to latest
      intPos = i;
      break;
    }
  }
  
  intPos++; // +1 for offset before slice

  //Get browsers which are in beta, dev, aurora
  var specialBrowsers = arr.slice(0, intPos).reverse();

  //Get rest of the browsers
  var otherBrowsers = arr.slice(intPos);

  //Concat both arrays
  return specialBrowsers.concat(otherBrowsers);
}

console.log(browserSort(normalTest));
console.log(browserSort(auroraTest));
console.log(browserSort(randomTest));