Ingame Purchase History Summarizer.js

// https://store.steampowered.com/account/history/
if($J('#load_more_button').is(":visible")) {
  $J('#load_more_button').click();
  console.log("Loading more history...");
} else {
  var summary = Array.prototype.map.call(jQuery(".wallet_table_row:has(.wht_type div:contains(In-Game Purchase))"), (i, row) => ({
      game: jQuery(".wht_items > div:first-child", row).text(),
      val: Number.parseFloat(jQuery(".wht_total", row).text().trim().replace(",", "."))
  })).reduce((acc, obj) => (acc[obj.game] = (acc[obj.game] || 0) + obj.val, acc), {})
  for(var game in summary) {
    console.log(game + ": " + summary[game]);
  }
}