Hacker News filter out domains/keywords. Edit filter_out array.

hn-filter.js

// ==UserScript==
// @name     Unnamed Script 714923
// @version  1
// @grant    none
// @match    https://news.ycombinator.com/*
// ==/UserScript==

var filter_out = [
  'NY Times',
  'nytimes.com'
];

var renumber = true;

[...document.querySelectorAll('.sitestr'), ...document.querySelectorAll('a.storylink')]
  .filter(e=>filter_out.some(ee=>e.textContent.match(ee)))
  .map(e=>e.closest('tr.athing'))
  .forEach(e=>{
    for (let i=0,ee=e,nee; i<3; i++) {
      nee = ee.nextElementSibling;
      ee.parentNode.removeChild(ee);
      ee = nee;
    }
});

if (renumber) {
  let snum;
  document.querySelectorAll('.rank')
          .forEach((e,i)=>{
            if (!snum) snum = +e.textContent.match(/\d+/)[0];
            e.textContent = (snum++)+'.';
          });
}