Hey! Tell us more about the problem - you moved to another device? Reinstalled your browser? Did you have the account before or did just sign in?

Yes i had the account before and logged in for years, today my Firefox Crashes all the time, so i checked if im already logged in with my email before i delete it the browser. so i delete it the browser and restall it again ans resign in again but everything is gone and i built my bookmarks for maybe 5 years and now all is gone:(

and no i did not moved to another device, it is all today at the same device (imac)

sorry for my bad English.

Did you try Bookmarks -> Manage Bookmarks -> Then in Library window (top bar) press Import and Backup -> Restore and then check preferred date.

nothing happened

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.

Check out this article: https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

i did everything but still nothing happen