Hi Spolix, This is the support forum for the Firefox Desktop Client. You can find the documentation on how to install Firefox Sync server at https://mozilla-services.readthedocs.io/en/latest/howtos/run-sync-1.5.html If you have more questions about the Firefox Sync Server, you can join [https://chat.mozilla.org/#/room/#sync:mozilla.org #sync:mozilla.org] on the [https://chat.mozilla.org Mozilla Matrix Chat server]. Have a nice day :).