You will need to install a user script manager extension to install this script.
Did you buy a bundle at itch.io with a shitload of games?
Do you want them all in your library?
Are you a lazy bum and don't want to add them all manually?
Then this is for you!
This script adds a button to add all the games listed on a page and add them automatically to your library.
It is still on a per page basis, but whatever you lazy bum. take it or leave it.