const IDENTITY_L10NID_MATCH_INDEX = 1;

browser.runtime.sendMessage('get-identities').then(reply=> {
  if (reply) {
    reply.content.identities.forEach(identity=> {
      const identityName = identity.l10nID.match(/userContext(\w*)\.label/)[IDENTITY_L10NID_MATCH_INDEX];

      document.querySelector('.identities-list').innerHTML += `<li><a href="#">${identityName}</a></li>`;
    });
    console.log('response from sdk addon: ', reply.content);
  }
});