browser.storage.local.get().then(obj => {
    const uuidMap = {};
    const siteMap = {};
    Object.keys(obj).forEach(k => {
        if (k !== 'identitiesState@@_firefox-default' && k.startsWith('identitiesState@@_')) {
            uuidMap[obj[k].macAddonUUID] = k;
        }
    });
    Object.keys(obj).forEach(k => {
        if (k.startsWith('siteContainerMap@@_')) {
            const site = k.substring(19);
            const uuid = uuidMap[obj[k].identityMacAddonUUID];
            if (typeof siteMap[uuid] === 'undefined') {
                siteMap[uuid] = [];
            }
            siteMap[uuid].push(site);
        }
    });
    console.log(JSON.stringify(siteMap));
});