Go directly to facebook messages, avoiding the feed time sink

manifest.json

{
  "manifest_version": 2,

  "name": "Nope facebook",
  "description": "Go directly to messages, avoiding the feed time sink.",
  "version": "1.0",

  "content_scripts": [
    {
      "matches": ["https://www.facebook.com/"],
      "js": ["nope_facebook.user.js"]
    }
  ]
}

nope_facebook.user.js

// ==UserScript==
// @name        Bypass facebook feed and go directly to messages
// @namespace   naure
// @include     https://www.facebook.com/
// @version     1
// @grant       none
// ==/UserScript==

if(location.pathname === "/") {
  // You went straight to the main feed? Nope.
  window.stop();
  document.body.innerHTML="<br/>&nbsp;<i>Going straight to messages…</i>"
  location.pathname = "/messages/";
}