They seem to be using this custom add-on collection: https://addons.mozilla.org/en-US/firefox/collections/16201230/What-I-want-on-Fenix/ https://addons.mozilla.

They seem to be using this custom add-on collection: https://addons.mozilla.org/en-US/firefox/collections/16201230/What-I-want-on-Fenix/ https://addons.mozilla.org/en-US/firefox/collections/1620123... But that was already possible to do on regular Firefox Beta and Nightly. We just had to create our own collection, like Iceraven did.