switch from homebrew to firefox overlay for macos

hosts/macbook/default.nix

@@ -22,7 +22,7 @@ darwin.lib.darwinSystem {
       };
       mailUser = globals.user;
       networking.hostName = "noah-masur-mac";
-      nixpkgs.overlays = [ nur.overlay ];
+      nixpkgs.overlays = [ nur.overlay firefox-darwin.overlay ];
       # Set registry to flake packages, used for nix X commands
       nix.registry.nixpkgs.flake = nixpkgs;
     }
@@ -32,6 +32,7 @@ darwin.lib.darwinSystem {
     ../../modules/applications/alacritty.nix
     ../../modules/applications/kitty.nix
     ../../modules/applications/discord.nix
+    ../../modules/applications/firefox.nix
     ../../modules/repositories/notes.nix
     ../../modules/programming/nix.nix
     ../../modules/programming/terraform.nix