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# Set up costmiku ffsync on Firefox

March 01, 2025
2 minutes

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

Create a Mozilla account

Go to 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.

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