flake/nixos/packages/overlays/firefox.nix

{...}: {
  nixpkgs = {
    overlays = [
      (
        final: prev: {
          firefox-unwrapped = prev.firefox-unwrapped.overrideAttrs (old: {
            # Firefox but with .mozilla moved to .config/mozilla
            # .patch file from aur/firefox-xdg
            # dont actually use this, it take ages to build... =.=
            patches =
              (old.patches or [])
              ++ [
                (prev.fetchgit {
                    url = "https://aur.archlinux.org/firefox-xdg.git";
                    rev = "ab291ab81140867dea4c08e4e1e4e3da0c73e4a6";
                    hash = "sha256-6VgCt028qs/Y5kl20qLUYwFI63pItsHPbLimOFIdsyo=";
                    sparseCheckout = [
                      "firefox-xdg-support.diff"
                    ];
                  }
                  + "/firefox-xdg-support.diff")
              ];
          });
        }
      )
    ];
  };
}