firefox-bin: link native-messaging-hosts to correct location (#303562)

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

···
     , extraPoliciesFiles ? []
     , libName ? browser.libName or applicationName # Important for tor package or the like
     , nixExtensions ? null
+    , hasMozSystemDirPatch ? (lib.hasPrefix "firefox" pname && !lib.hasSuffix "-bin" pname)
     }:
 
     let
···
             ${lib.optionalString (!xdg-utils.meta.broken) "--suffix PATH ':' \"${xdg-utils}/bin\""} \
             --suffix PATH ':' "$out/bin" \
             --set MOZ_APP_LAUNCHER "${launcherName}" \
+        '' + lib.optionalString hasMozSystemDirPatch ''
             --set MOZ_SYSTEM_DIR "$out/lib/mozilla" \
+        '' + ''
             --set MOZ_LEGACY_PROFILES 1 \
             --set MOZ_ALLOW_DOWNGRADE 1 \
             --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH" \
             --suffix XDG_DATA_DIRS : '${adwaita-icon-theme}/share' \
             --set-default MOZ_ENABLE_WAYLAND 1 \
+        '' + lib.optionalString (!hasMozSystemDirPatch) ''
+            ${lib.optionalString (allNativeMessagingHosts != []) "--run \"mkdir -p \\\${MOZ_HOME:-~/.mozilla}/native-messaging-hosts\""} \
+            ${lib.concatMapStringsSep " " (ext: "--run \"ln -sfLt \\\${MOZ_HOME:-~/.mozilla}/native-messaging-hosts ${ext}/lib/mozilla/native-messaging-hosts/*\"") allNativeMessagingHosts} \
+        '' + ''
             "''${oldWrapperArgs[@]}"
         #############################
         #                           #
···
 
         install -D -t $out/share/applications $desktopItem/share/applications/*
 
+      '' + lib.optionalString hasMozSystemDirPatch ''
         mkdir -p $out/lib/mozilla/native-messaging-hosts
         for ext in ${toString allNativeMessagingHosts}; do
             ln -sLt $out/lib/mozilla/native-messaging-hosts $ext/lib/mozilla/native-messaging-hosts/*
         done
+      '' + ''
 
         mkdir -p $out/lib/mozilla/pkcs11-modules
         for ext in ${toString pkcs11Modules}; do