Hi

Are the bookmarks still on your other device where you have Firefox installed?

No, only on my Mac Mini.

Okay, good to know you still have your bookmarks. What is the other device that you wish to sync your bookmarks to?

I think you did not understand. i bought a mac mini, downloaded firefox as i always do on any device, and logged into my account to sync bookmarks, passwords, history etc. Turns out it didn't sync anything. It's not sincere about ANYTHING. I don't know if there was a problem with your database, but I want to save my data again. I’m not logged into any other one device. Only on this Mac mini.

Did you have any saved bookmarks on this FIREFOX account before? (Excluding other browsers such as Chrome or Safari).

Yes, sure. Ever only on this account. I’m not use others browsers.

Hi

It appears from your question, that you are using Firefox Sync as a back up service. This is not what Sync is designed to do. The Firefox Sync service takes a copy of the data you wish to include and transfers it to a second device (typically a mobile device such as a tablet or a telephone) running a copy of Firefox. The storage in between all attached devices is both temporary and fragile and is not stable enough to be (and is not designed as) a reliable backup service.

If you have a copy of your Firefox profile for desktop Firefox, you may be able to recover your bookmarks and other data. Please have a read of this article.

If you have a copy of your data on a mobile version of Firefox, please follow these instructions to connect it to Firefox Sync to copy your data.