Hi

Thank you for your question about the Firefox Sync service.

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.

Thank you man that is helpful but I just checked that my Firefox bookmarks and passwords are still available on my phone (Android) how they were before data lost. How can transfer them to Computer Firefox?

And from where came these old version of bookmarks, which were synced? - no this question maybe is not important.

Hi

If you sign into your Firefox Account in the desktop version of Firefox (type about:preferences#sync in the address bar to quickly get to the settings) and give it a short while to allow it to Sync, a copy of your bookmarks should move across.