nixos/firefox: add config option for Web eID support

This allows users to set
`programs.firefox.nativeMessagingHosts.euwebid = true` to make the
native companion app available in Firefox.

It's used by the Web eID browser extension
(https://addons.mozilla.org/en/firefox/addon/web-eid-webextension/),
which can be tried out at https://web-eid.eu/ - pressing the
"Authenticate" button there should open a new window.

nixos/modules/programs/firefox.nix

@@ -201,6 +201,7 @@ in
     nativeMessagingHosts = mapAttrs (_: v: mkEnableOption (mdDoc v)) {
       browserpass = "Browserpass support";
       bukubrow = "Bukubrow support";
+      euwebid = "Web eID support";
       ff2mpv = "ff2mpv support";
       fxCast = "fx_cast support";
       gsconnect = "GSConnect support";
@@ -217,6 +218,8 @@ in
         extraPrefs = cfg.autoConfig;
         extraNativeMessagingHosts = with pkgs; optionals nmh.ff2mpv [
           ff2mpv
+        ] ++ optionals nmh.euwebid [
+          web-eid-app
         ] ++ optionals nmh.gsconnect [
           gnomeExtensions.gsconnect
         ] ++ optionals nmh.jabref [
@@ -230,6 +233,7 @@ in
     nixpkgs.config.firefox = {
       enableBrowserpass = nmh.browserpass;
       enableBukubrow = nmh.bukubrow;
+      enableEUWebID = nmh.euwebid;
       enableTridactylNative = nmh.tridactyl;
       enableUgetIntegrator = nmh.ugetIntegrator;
       enableFXCastBridge = nmh.fxCast;

pkgs/applications/networking/browsers/firefox/wrapper.nix

@@ -5,7 +5,7 @@
 ## various stuff that can be plugged in
 , ffmpeg_5, xorg, alsa-lib, libpulseaudio, libcanberra-gtk3, libglvnd, libnotify, opensc
 , gnome/*.gnome-shell*/
-, browserpass, gnome-browser-connector, uget-integrator, plasma5Packages, bukubrow, pipewire
+, browserpass, gnome-browser-connector, uget-integrator, plasma5Packages, bukubrow, web-eid-app, pipewire
 , tridactyl-native
 , fx_cast_bridge
 , udev
@@ -65,6 +65,7 @@ let
         [ ]
           ++ lib.optional (cfg.enableBrowserpass or false) (lib.getBin browserpass)
           ++ lib.optional (cfg.enableBukubrow or false) bukubrow
+          ++ lib.optional (cfg.enableEUWebID or false) web-eid-app
           ++ lib.optional (cfg.enableTridactylNative or false) tridactyl-native
           ++ lib.optional (cfg.enableGnomeExtensions or false) gnome-browser-connector
           ++ lib.optional (cfg.enableUgetIntegrator or false) uget-integrator