This is a simple js/bookmarklet to show the grades of all students in doc.orizondo.org/subject/notas.html (where subject is the current id of the subject you're taking with Orizondo).
We have two files: bookmarklet.js and src.js
Bookmarklet
In order to use the bookmarlet you just have to create a new bookmark (Ctrl + D in Chrome, Firefox and IE6+), put any name and the content of bookmarklet.js in the URL. Now, when you consult your grade, hit the bookmark you just created and the grades of all your classmates will be shown.
Javascript
To run the javascript just go to consult your grade and then hit F12 (Developer options) and paste the content of the src.js file, hit enter and the grades should be shown.
After I developed this script, I realized that if you change the url from */notas.html to */notas.js you can see the JSON object containing the grades from all the tasks and all the classmates.
This script was made for personal use, but since I'll be taking no classes with that professor ever, I wanted to share it.