Note that in Firefox 57, the add-on is not able to configure the eID middleware in your browser.

See the FAQ on https://eid.belgium.be/en/log#7499 (Windows), https://eid.belgium.be/en/log#7503 (Mac) and https://eid.belgium.be/en/log#7507 (Linux) for the procedure on how to do that.

Dans la version 58 de Firefox, il ne sera plus nécessaire de configurer comme ça.