Home manager merge firefox bookmark and profile settings

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Digging back into the problem with fresh eyes, it does seem like I haven’t done my due diligence properly. With some more testing, I’ve gotten the error down to a proper minimal working example. It seems like the issue isn’t between the bookmark files at all, but rather between the bookmark file and profile settings.

code and error 
# home.nix
{ config, pkgs, ... }:

{
  home-manager = {

    useGlobalPkgs = true;
    users.fluff = { pkgs, ... }: {
      programs.librewolf = {
        enable = true;
     	profiles.default = {
     	  settings = {
     	    "privacy.fingerprintingProtection"=true;
     	    "privacy.resistFingerprinting"=false;
     	  };
     	};
      };
	  imports = [
	    (./. + "/admin_bookmarks.nix")
	  ];
      home.stateVersion = "25.11";
    };
  };
}


# admin_bookmarks.nix
{ config, pkgs, ... }:

{
  programs.librewolf.profiles.defualt.bookmarks = {
    force = true;
    settings = [
      { name = "NixOS";
        bookmarks = [
      	  { name = "packages";
      	    url = "https://search.nixos.org/packages";
      	  }
        ];
      }
    ];
  };
}


building the system configuration...
error:
       … while calling the 'head' builtin
         at /nix/store/h38417wn715s107d3ihxkskzsj7pa666-source/lib/attrsets.nix:1696:13:
         1695|           if length values == 1 || pred here (elemAt values 1) (head values) then
         1696|             head values
             |             ^
         1697|           else

       … while evaluating the attribute 'value'
         at /nix/store/h38417wn715s107d3ihxkskzsj7pa666-source/lib/modules.nix:1118:7:
         1117|     // {
         1118|       value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |       ^
         1119|       inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/h38417wn715s107d3ihxkskzsj7pa666-source/nixos/modules/system/activation/top-level.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error:
       Failed assertions:
       - fluff profile: Must have exactly one default LibreWolf profile but found 2, namely default, defualt
       - fluff profile: Must not have a LibreWolf profile with an existing ID but
         - ID 0 is used by default, defualt
Command 'nix-build '<nixpkgs/nixos>' --attr config.system.build.toplevel --dry-run' returned non-zero exit status 1.