removes the avatars of ten-or-less rep users

avatar_blocker.user.js

// ==UserScript==
// @name        avatar blocker
// @namespace   about:blank
// @description removes the avatars of ten-or-less rep users
// @include     http://chat.stackoverflow.com/rooms/*
// @version     1
// @grant       none
// ==/UserScript==

//gets the reputation of the user that owns this user-container
function getRep(userBox){
    var id = parseInt(userBox.id.replace(/[^\d]*/, ""));

    //`users` might not exist yet, if the page just recently loaded.
    if (users[id] == undefined){return undefined;}
    return users[id].reputation;
}

//alters the image in this user-container to the default anonymous avatar.
function anonymize(userBox){
    userBox.getElementsByClassName("avatar")[0].getElementsByTagName("img")[0]["src"] = IMAGE("anon.png");
}

//iterate through the users in the sidebar, anonymizing anyone with ten or less rep
function check_users(){
    sidebar = document.getElementsByClassName("sidebar-widget")[0];
    userBoxes = sidebar.getElementsByClassName("user-container");
    for(var i = 0; i < userBoxes.length; i+=1){
        var userBox = userBoxes[i];
        var rep = getRep(userBox);
        if (rep < 10){
            anonymize(userBox);
        }
    }
}

//check users once a second
window.setInterval(check_users, 1000);