gog-affiliate-token-keeper/background.js

const TOKEN = 'cd792dcdf21d1c0afb84ef101bfcde35f5f7d9fa';
const DOMAIN = '.gog.com';
const PATH = '/';
const EXPIRATION = 2147483647.0;
const COOKIES = ['pp', 'pp_st'];

chrome.runtime.onMessage.addListener(
    function(request, sender, sendResponse) {
        if (request.message === 'set_gog_cookies') {
            COOKIES.forEach(function(name) {
                let cookie = {
                    url: 'https://www.gog.com/',
                    name: name,
                    value: TOKEN,
                    domain: DOMAIN,
                    path: PATH,
                    expirationDate: EXPIRATION
                };
                chrome.cookies.set(cookie);
            });
        }
    }
);