Automatically save the page you're on to the Internet Archive's Wayback Machine.

auto-wayback.user.js

// ==UserScript==
// @name Auto Wayback
// @description Automatically save the page you're on to the Internet Archive's Wayback Machine.
// @version 1.0.0
//
// @match https://wsj.com/*
// @match https://cnn.com/*
// @match https://*.cnn.com/*
// @match https://theguardian.com/*
// @match https://snopes.com/*
// @match https://theverge.com/*
// @match https://bloomberg.com/*
// @match https://*.foxnews.com/*
// @match https://washingtonpost.com/*
// @match https://theregister.com/*
// @match https://wired.com/*
// @match https://cbsnews.com/*
// @match https://nytimes.com/*
// @match https://forbes.com/*
// @match https://newyorker.com/*
// @match https://theatlantic.com/*
// @match https://variety.com/*
// @match https://bbc.com/*
// @match https://reason.com/*
// @match https://techdirt.com/*
// @match https://slate.com/*
// @match https://*.wikipedia.org/*
// @match https://wikipedia.org/*
// @match https://*.spiegel.de/*
// @match https://spiegel.de/*
// @match https://news.ycombinator.com/*
// @match https://arstechnica.com/*
// @match https://medium.com/*
// @match https://smithsonianmag.com/*
//
// @grant GM_xmlhttpRequest
// @run-at document-start
// ==/UserScript==

(async () => {
  const save_visited = true
  const save_all_links = false // Enable 'Save outlinks' (Requires Cookie)
  const save_all_links_no_host_restriction = true
  const IAcookie = ''

  const saveAllLinks = () => {
    let sent_array = []
    for (var elements1 = document.getElementsByTagName("a"), i = elements1.length - 1; i >= 0; i--) {
      const URL1 = decodeURI(elements1[i].href)
      if ((save_all_links_no_host_restriction || URL1.match(location.hostname)) && -1 === sent_array.indexOf(URL1)) {
        sent_array[sent_array.length] = URL1
        GM_xmlhttpRequest({
          method: 'POST',
          url: `http://web.archive.org/save/${encodeURI(URL1)}`,
          data: `url=${encodeURI(URL1)}&capture_outlinks=on&capture_all=on&capture_screenshot=on`,
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded',
            'cookie': IAcookie,
            'referer': 'https://web.archive.org/save'
          }
        })
        console.log('http://web.archive.org/' + encodeURI(URL1))
        // Print URI lists you have sent the request to save. (on console, for debug)
      }
    }
  }

  // Save the page you have just visited.
  if (save_visited) {
    GM_xmlhttpRequest({
      method: 'POST',
      url: `http://web.archive.org/save/${encodeURI(decodeURI(location.href))}`,
      data: `url=${encodeURI(decodeURI(location.href))}&capture_outlinks=on&capture_all=on&capture_screenshot=on`,
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'cookie': IAcookie,
        'referer': 'https://web.archive.org/save'
      }
    })
    console.log('http://web.archive.org/' + encodeURI(decodeURI(location.href)));
  };

  // Save all links you can see on a page.
  if (save_all_links) {
    setTimeout(function() {
      saveAllLinks()
    }, 5000)
  }

})()