Checks every single Genshin Impact code.
This extensions helps Genshin Impact players search codes. It enters code automatically and checks it. It can take more than 10 minutes, but you can be sure that all known codes are checked - those from past too, maybe they will work, who knows!
Extensions add small button to check all codes on https://genshin.hoyoverse.com/en/gift.
This extension is still under development.