reddit-global.user.js

// ==UserScript==
// @name            Reddit default to global geo filter
// @description     Use geo_filter=GLOBAL by default
// @namespace       https://gist.github.com/rjocoleman/a791033a7edfd0d084d07c73e62e8a2f/raw/f5bff6c051cf48e04352bea8c17919eba05ec0ea/reddit-global.user.js
// @version         0.1.0
// @author          rjocoleman
// @license         MIT
// @released        2021-02-19
// @updated         2021-02-19
// @match           *://www.reddit.com/*
// @match           *://old.reddit.com/*
// @run-at          document-start
// ==/UserScript==
(() => {
  'use strict';
  // before the DOM has loaded
  document.addEventListener('DOMContentLoaded', () => {
    // after the DOM has loaded
  
    // only do stuff if we're not logged in
    if (document.querySelectorAll('a[href*="login"]').length) {
      const url = new URL(window.location.href)
      // if we're on the home page or /r/popular
      if (['', '/r/popular'].includes(url.pathname.replace(/\/+$/, ''))) {
        // and we haven't explicitly set a geo_filter
        if (!url.searchParams.has('geo_filter')) {
          // set GLOBAL
          url.searchParams.set('geo_filter', 'GLOBAL');
          // send us to /r/popular because that's what non-logged in home is
          url.pathname = '/r/popular';
          // reload the page with this geo_filter set
          location.assign(url);
        }
      }
    }
  });
})();