+++
title = "Set up costmiku ffsync on Firefox"
description = "Shortest article demonstrating how to configure Firefox to synchronise to costmiku ffsync"
date = 2025-03-01
[extra]
toc = true
+++

This has not been written by the RootsourceCC team, but still describes it accurately.

Create a Mozilla account

Go to [https://accounts.firefox.com](https://accounts.firefox.com) and follow the "Sign up" steps to create an account.

**Configure Firefox Desktop**

Please open `about:config` in your Firefox and point `identity.sync.tokenserver.uri` to `https://ffsync.costmiku.space/1.0/sync/1.5`.

**Configure Firefox based browsers on Android**

These steps have to be followed in a strict order. Failing to do it would probably lead to issues. This should also work in Firefox based browsers like Mull (tested) and others.

 - Open Firefox Browser -> Settings -> About Firefox -> tap 5 times in Firefox logo.
 - Go back to Settings -> Account -> you should see a new option `Sync Debug`, tap on it.
 - Select `Custom Sync server` and write there your endpoint. It should be https://ffsync.costmiku.space/1.0/sync/1.5.
 - Exit Firefox completely, reopen and then follow the steps of "Connect a device" to your Firefox account.
 - After a successful auth process the sync should start working.

Configure Firefox on iOS

Not tested.
 - Open Firefox Browser -> Settings -> About Firefox -> tap on the field with Firefox and version number.
 - Go back to Settings -> Account -> you should see a new option `Advanced Sync Settings`, tap on it.
 - Toggle Use Custom Sync Token Server and write there your endpoint. It should be `https://ffsync.costmiku.space/`.
 - You might also need to toggle the switch for custom FxA login server and set it to `https://accounts.firefox.com`
 - Exit Firefox completely, reopen and then follow the steps of "Connect a device" to your Firefox account.
 - After a successful auth process the sync should start working.