Simple Tampermonkey Script that will show the tweet character count on Twitter!

tweetcount.js

// ==UserScript==
// @name         Show Twitter Count
// @namespace    mxmtsk.twittercount
// @version      0.1
// @description  Show good old twitter count instead of the donut
// @author       mxmtsk
// @match        https://twitter.com/*
// @grant        none
// @run-at document-idle
// ==/UserScript==


function getForms() {
    // add event listener to forms not already intialized
    jQuery('form.tweet-form[data-has-count-listener!="1"]').on('uiUpdateCounter', function(e, data) {
        // only show until 280 characters so twitters own warnings will display if you exceed the limit
        if(data.tweetLength <= 280) {
            var length = parseInt(data.tweetLength);
            // if you'd much rather like to count down to zero instead of up comment the line in
            // length = 280 - data.tweetLength
            
            jQuery(this).find('.tweet-counter').text(length);
        }
    });
    jQuery('form.tweet-form[data-has-count-listener!="1"]').attr('data-has-count-listener', "1");
}

document.onreadystatechange = function() {
    getForms();
    // This will look up new forms on the page every second
    setInterval(getForms, 1000);
};