AutoUsernameMCVote.user.js

// ==UserScript==
// @name        AutoUsernameMCVote
// @namespace   AutoUsernameMCVote
// @include     http://minecraft-mp.com/server/*/vote/
// @include     http://minecraft-server-list.com/server/*/vote/
// @include     http://minecraftservers.org/vote/*
// @include     http://topg.org/Minecraft/in-*
// @description Insert Username into fields on Minecraft Voting Sites
// @version     1
// @grant       none
// ==/UserScript==

var username = "EliteMasterEric";

console.log("AutoUsernameMCVote");
switch(window.location.hostname){
    case "minecraft-mp.com":
        console.log("AutoUsernameMCVote - Minecraft-MP.com");
        document.getElementById('nickname').value = username;
        break;
    case "minecraft-server-list.com":
        console.log("AutoUsernameMCVote - MinecraftServerList.com");
        document.getElementsByName('ign')[0].value = username;
        break;
    case "minecraftservers.org":
        console.log("AutoUsernameMCVote - MinecraftServers.org");
        document.getElementsByName('username')[0].value = username;
        break;
    case "topg.org":
        console.log("AutoUsernameMCVote - Topg.org");
        document.getElementsByName('mc_username')[0].value = username;
    default:
        break;
}