How can I get cookies with an extension?

Question

JavaScript

I have a website, then A.
And an extension, then B.
On A there are cookies for authorization.
How can I enable authorization from popup by getting cookies from A. I don't really want to use cookies. And is it possible to implement such a cross-domain trick?

Answer 1

The script in content.js is executed directly on the pages of open tabs, so you can pick up cookies there.