How to get variables from a site when writing a Chrome extension?

Question

JavaScript

Good afternoon, I am faced with the task of pulling information, or rather variables, from the site using the Chrome extension. (I am writing the extension myself)
They are global on the site, my script cannot accept variables for some reason. Who will tell you how to do it?

Answer 1

Extension scripts run in a separate environment and do not have access to site methods and variables. The only thing they can do is modify the DOM. True, there is one thing, but if a flash application is used on the site, then you can call the methods of this flash drive.
https://developer.chrome.com/extensions/content_sc...