• Firefox synchronization works with two services: authentification and synchronization storage. Both of these services are hosted on mozilla fundation servers, but you can install and use official service on your own server. As everyday sync storage.
  
• Here we get interested into hosting a sync server on a raspberry pi using arm32v7 architecture. This server will run into a docker container.
• For authentification, we use default mozilla auth services.
• Github Repository: https://github.com/AugustinVoiMa/firefox-sync-docker-raspbian-arm
• Docker Image: https://hub.docker.com/r/augustinvm/firefox-sync-docker-raspbian-arm

• Pull Image from Docker hub:

docker pull augustinvm/firefox-sync-docker-raspbian-arm

• Run the image:

docker run -it -p 5000:5000 --name fsync augustinvm/firefox-sync-docker-raspbian-arm

Don't daemonize on run, we need to set up configuration:

Two config fields are asked:

• First is external URL. It is the url in header passed by your web server proxy configuration or the url used for direct access.
  Example: http://fsync.your-domain.net
• Second is a SQLAlchemy database URI for your database ( Docker host ip on container interface will substitute %dockerhost )
  Example for a mysql server on docker host which knows fsync user identified by fsync_pass having sufficient right on existing fsync_db database.
  'pymysql://fsync:fsync_pass@%dockerhost/fsync_db
  ***** Database may have been correctly configured (/etc/mysql/my.cnf: bind-address = 0.0.0.0 and binding filters in mysql users like 'fsync'@'172.17.0.1')

Then sync server should run, you can detach now Ctrl+P, Ctrl+Q

• For nginx, following basic configuration works:

server{
      listen 80;
      server_name fsync.your-domain.net;

      location / {
          proxy_set_header Host $http_host;
          proxy_set_header X-Forwarded-Proto $scheme;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header X-Real-IP $remote_addr;
          proxy_redirect off;
          proxy_read_timeout 120;
          proxy_connect_timeout 10;
          proxy_pass http://127.0.0.1:5000/;
      }
      access_log /var/log/fsync.log;
      error_log /var/log/fsync.err;
}

• Go to firefox advanced configuration about:config.
• Search for identity.sync.tokenserver.uri entry.
• Change its value to your new synchronization server with following URI /token/1.0/sync/1.5
  Example: http://fsync.yout-domain.net/token/1.0/sync/1.5
• Repeat this then reconnect from all synchronized firefox instances you use.