Orders messages into the right order on chat history pages of HTML exports produced by Facebook's "Download your information" tool (https://www.facebook.com/dyi). Make sure to go to chrome://extensions > Tampermonkey > Details and enable "Allow access to file URLs" to allow the script to work.
// ==UserScript==
// @name Facebook Export: Show messages in the right order
// @namespace http://tampermonkey.net/
// @version 0.1.1
// @description Orders messages into the right order on chat history pages of HTML exports produced by Facebook's "Download your information" tool (https://www.facebook.com/dyi). Make sure to go to chrome://extensions > Tampermonkey > Details and enable "Allow access to file URLs" to allow the script to work.
// @author SUM1
// @match *:///*/messages/inbox/*/message*.html
// @match *://*/messages/inbox/*/message*.html
// ==/UserScript==
(function() {
'use strict';
if (document.querySelector('._4t5n')) { // Check if the container div of all messages exists. If it does,
let chatContainer = document.querySelector('._4t5n') // assign the container div to a variable for brevity;
for (var i = 1; i < chatContainer.childNodes.length; i++) { // for each child node of the container div (i.e., each message),
chatContainer.insertBefore(chatContainer.childNodes[i], chatContainer.firstChild); // insert it before the first message div.
}
}
})();