Gitbook.user.js

// ==UserScript==
// @name        Gitbook
// @match     https://docs.openbrush.app/*
// @description Adds edit link to gitbook pages on https://docs.openbrush.app/
// @version     0.1
// @match       https://www.tampermonkey.net/index.php?version=4.13.6136&ext=fire&updated=true
// @icon        https://www.google.com/s2/favicons?domain=tampermonkey.net
// @grant       none
// ==/UserScript==

(function() {
  'use strict';

  setTimeout(function () {
    let el = document.body.appendChild(document.createElement('a'));
    el.id = 'quickgblink';
    el.innerText = 'EDIT';
    el.href = '#';
    el.style.position = 'fixed';
    el.style.top = '0';
    el.style.zIndex = '1000';
    el.style.right = '0';
    el.style.width = '4em';
    el.style.height = '2em';
    el.style.border = '1px solid black';
    el.style.padding = '3px';
    el.style.textAlign = 'center';

    function updateLink() {
      var path = document.location.href.replace('https://docs.openbrush.app/', '');
      el.href = 'https://app.gitbook.com/o/-Mikdl01-6Jga6QTk0rK/s/-Mikdwm98p33AibfiSqN/' + path;
    }

    updateLink();
    el.onmousemove = updateLink;
  }, 1000); // 1 second
})();