Reddit enhancement suite chrome extension: https://redditenhancementsuite.com/
Click the extension icon and it turns off the subreddit's css. Fun fact, the downvote arrow being hidden isn't an option you check off in the subreddit settings - it's just some css tricks. Without a sub's custom css you can downvote to your heart's content.
btw on his whatpulse he also used this:
File Pumper Oshino Shinobu 1h55m53s 860 1,163
this is what old AQN used to inject itself to a file like firefox.exe and he has 2 hour of usage as well as 1100 clicks in it
if you check other users of this on whatpulse its literally all other osu cheaters who has AQN present too in various forms: