Github Script - Flip Comparison Direction - Install: https://git.io/vXQ4p

GithubFlipComparison.user.js

// ==UserScript==
// @name         Github - Flip Comparison
// @namespace    http://dessix.net/userscripts/github/flip
// @version      0.1
// @updateURL    https://gist.github.com/Dessix/d1d4c4090f4348cf030ec61977952898/raw/GithubFlipComparison.user.js
// @description  Flip github branches in comparison.
// @author       Dessix
// @match        *://github.com/*/*/compare/*...*
// @grant        none
// @require      https://code.jquery.com/jquery-3.1.1.slim.min.js
// ==/UserScript==

(function() {
	(function ($, undefined) {
		'use strict';
		function swapComparison() {
			const path = window.location.pathname;
			const reg = /^(.*\/)([^\/]+)\.{3}(.*)$/;
			const dest = path.replace(reg, "\$1\$3...\$2");
			//alert(`swapping from ${reg} => ${dest}`);
			window.location.pathname = dest;
		}
		$(function() {
			$(".range-editor.js-range-editor")
				.find(".range-editor-icon")
				.addClass("btn")
				.addClass("text-green")
				.click(swapComparison)
				.css("border", "solid 1px green")
				.css("border-radius", "3px")
				.css("padding", "2px")
				.css("transform", "scale(1.7)")
				.css("transform-origin", "center center")
				;
		});
	})(window.jQuery.noConflict(true));
})();