Twitter Avatar in Menu

twitter-avatar-in-menu.user.js

// ==UserScript==
// @name           Twitter Avatar in Menu
// @namespace      http://patik.com/code/user-scripts/
// @include        https://twitter.com/*
// @include        http://twitter.com/*
// @version        2.1.20131118
// ==/UserScript==

(function _twitter_avatar_in_menu() {
        // Find the generic 'person' outline in the nav bar, which will be replaced
    var menuitem = document.querySelector('.nav-me') || null,
        // Get avatar from the user menu (gear icon) to ensure we don't grab some other avatar
        avi = document.querySelector('.global-nav .current-user .avatar[src]');

    if (menuitem && avi.src) {
        menuitem.style.cssText = 'background-image: url("' + avi.src + '") !important;background-position: 0 0;border-radius: 4px;background-size: 21px 22px;';
    }
}());

Shows your avatar in the top menu on Twitter.com so you can tell at a glance which account you're logged in under.

Click on the 'raw' link in the top right of the gist to prompt Firefox & Chrome to install it as a user script.

Updated to work with the current site.