hackerNewsPostStats.js

// Run in the js console while viewing a submission in HackerNews
// for example while visiting https://news.ycombinator.com/item?id=27799859

console.log('Users with more than 1 answer:')
var counts = {}; 
var arr = Object.values(document.getElementsByClassName('hnuser')).map(h => h.innerHTML); 
arr.forEach(function (x) { 
  counts[x] = (counts[x] || 0) + 1; 
}); 
var sorted = Object.entries(counts);
var result = '';
sorted.sort((a,b) => b[1]-a[1])
sorted.forEach(i => {
  if(i[1] > 1) {
  	result += '■'.repeat(i[1]) + ` ${i[0]} (${i[1]})\n`
  }
})
console.log(result)

Works on single-page posts in hn but not in multi-page ones. That would require searching for the "more" link, downloading following pages, accumulating totals.