key_count.js

/*
	Run at https://store.steampowered.com/account/history/
	Right click inspect element and load the pages if needed

	995 : Chroma Case Key
	215 : Chroma 2 Case Key
	111 : Falchion Case Key
	71 : Operation Vanguard Case Key
	69 : Huntsman Case Key
	58 : Operation Phoenix Case Key
	28 : Operation Breakout Case Key
	11 : CS:GO Case Key
	5 : Winter Offensive Case Key
*/

_keys = {}

jQuery('.wth_payment').each(function(i, e) {
    if((t = e.innerText.trim()) && t.indexOf('Case Key') == -1) return
    
    _case = t.match(/(?:\d+ |)(.*?)$/)[1]
    
    _keys[_case] = (parseInt(t) || 1) + (_keys[_case] || 0)
})

jQuery.each(_keys, function(c, k) {
   console.log(k, ':', c)
})