Google translated:

Hello, I need urgent help please. I have formatted my PC and logged in as usual in the Firefox browser and wanted to synchronize my data and now I have noticed that everything is gone, my passwords, bookmarks, etc.

my account is secured with an authenticator, I ask you, I need my data back, what option is there

Thanks

Unfortunately sync isn't for backups if your new sync connects it will clear out previous sync data to match the new sync thus any sync data before is cleared out and nothing can be retrieved at this point.

i restored my password and now all data are erased