[piccogabriele]

They are just cached in an encrypted token in your browser, not sent to any server. You can have a look in the source code if you are interested: https://github.com/GabrielePicco/hacker-news-rich

[piccogabriele]

Here a very simple explanation of the architecture: https://medium.com/@PiccoGabriele/creating-and-hosting-an-ha...