Firefox plug-in server address: http://hostaddress:8010/v2

docker-compose.yml

---
services:
  languagetool:
    image: erikvl87/languagetool
    container_name: languagetool
#    ports:
#        - 8010:8010  # Using default port from the image
    networks:
      - nginx_default
    environment:
#        - langtool_languageModel=/ngrams  # OPTIONAL: Using ngrams data
        - Java_Xms=512m  # OPTIONAL: Setting a minimal Java heap size of 512 mib
        - Java_Xmx=1g  # OPTIONAL: Setting a maximum Java heap size of 1 Gib
#    volumes:
#        - /path/to/ngrams/data:/ngrams
    restart: unless-stopped

networks:
  nginx_default:
    external: true
    name: nginx_default