No documentation about how to install NUR packages with home-manager

[AprilGrimoire]

https://discourse.nixos.org/t/how-to-use-home-manager-with-nur/26941/4
Some NUR repositories don't have overlays, which require another method to install.

[naillizard]

for the life of me, I cannot get this to work.

I've followed the steps in the README, it works from nix-env or nix-shell, but I don't get it how to use it from home-manager.

|- flake.nix


|-- hosts/nixos/default.nix <-- home-manager is included here

|-- profiles/personal/default.nix <- my home-manager
|-- system/programs
|--- default.nix <-- imports a bunch of stuff

|--- firefox.nix <-- I'm trying to use @rycee firefox-addons here

in firefox.nix, I've tried different ways from different sources, some using 24.05 others older, I've even checked out @rycee 's own configuration and I just put it down as my fundamental lack of understanding, I'm fairly new to the NixOS world.