show max rating on Topcoder MarathonMatch standings

manifest.json

{
  "manifest_version": 2,
  "name": "show max rating on Topcoder MarathonMatch standings",
  "version": "1.0",
  "author": "Leonardone",
  "description": "show max rating on Topcoder MarathonMatch standings",
  
  "content_scripts": [
    {
      "matches": ["*://community.topcoder.com/longcontest/*"],
      "include_globs": ["*ViewStandings*", "*ViewOverview*"],
      "js": ["script.js"]
    }
  ]
}

script.js

// script.js
// Browser WebExtention
// show max rating on Topcoder MarathonMatch standings
// author: Leonardone

(function() {
// start of coder

var elms = document.getElementsByTagName('a');
var coders = [];
for (i = 0; i < elms.length; i++) {
	var e = elms[i];
	var cn = e.className.toString();
	if (!cn.match(/coderText\w+/)) {
		continue;
	}
	var c = coders.length;
	coders[c] = e;
}

var xhr = (function() {
	if (window.XMLHttpRequest) {
		return new XMLHttpRequest();
	}
	if (window.ActiveXObject) {
		try {
			return new ActiveXObject('Microsoft.XMLHTTP');
		} catch (_) {}
		try {
			return new ActiveXObject('Msxml2.XMLHTTP');
		} catch (_) {}
	}
	return {
		'open': function() {},
		'send': function() {}
	};
})();

function getUserInfo(i) {
	var e = coders[i];
	var href = e.href.toString();
	var m = href.match(/cr=(\d+)/);
	var id = m[1];
	var name = e.innerHTML.toString();
	return {
		"id": id,
		"name": name
	};
}

function getCoderClass(r) {
	if (r >= 2200) {
		return 'coderTextRed';
	} else if (r >= 1500) {
		return 'coderTextYellow';
	} else if (r >= 1200) {
		return 'coderTextBlue';
	} else if (r >= 900) {
		return 'coderTextGreen';
	} else if (r >= 0) {
		return 'coderTextGray';
	} else {
		return 'coderTextBlack';
	}
}

function parse(n, xml) {
	var maxRating = -1;
	var lastDate = '1900-01-01';
	var lastRating = -1;
	var rs = xml.getElementsByTagName('row');
	for (var j = 0; j < rs.length; j++) {
		var es = rs[j].getElementsByTagName('new_rating');
		var rt = parseInt(es[0].innerHTML.toString());
		maxRating = Math.max(maxRating, rt);
		var ds = rs[j].getElementsByTagName('date');
		var dt = ds[0].innerHTML.toString();
		if (dt > lastDate) {
			lastDate = dt;
			lastRating = rt;
		}
	}

	var s3 = document.createElement('span');
	s3.className = getCoderClass(maxRating);
	maxRating = Math.max(0, maxRating);
	s3.innerHTML = '&nbsp;(' + maxRating.toString() + ')';
	coders[n].appendChild(s3);
	coders[n].title = 'now: ' + lastRating.toString() + ', max:' + maxRating.toString();
}

function load(i) {
	var interval = 1000; // milliseconds
	if (i >= coders.length) {
		return;
	}
	xhr.onreadystatechange = function() {
		if (xhr.readyState !== 4) { return; }
		if (xhr.status !== 200) {
			return;
		}
		var xml = xhr.responseXML;
		parse(i, xml);
		window.setTimeout(function() {
			load(i+1);
		}, interval);
	};
	var info = getUserInfo(i);
	var protocol = 'https';
	var server = 'community.topcoder.com';
	var command = 'tc?module=BasicData&c=dd_marathon_rating_history&cr=';
	var url = protocol + '://' + server + '/' + command + info.id;
	xhr.open('GET', url, true);
	xhr.responseType = 'document';
	if (xhr.setRequestHeader) {
		xhr.setRequestHeader('Content-type', 'text/xml');
	}
	xhr.overrideMimeType = 'text/xml';
	xhr.send(null);
}

load(0);

// end of code
})();

FireFoxだとこれちゃんと機能しないね・・・（いあ他のブラウザでもちゃんと動くかは未確認？
アドオン再読込をクリックしたのが原因ぽい？