After an update, I was asked to create a new profile or log in with an existing one. i chose the latter, but all my data - passwords, bookmarks, history is gone anyway!!! What‘s wrong?! I had EVERYTHING saved there!!!

My short summary already describes it. Firefox was slow, needed an update, but after the update, suddenly, I wasn‘t logged in any longer. Reset the password, used the known e-mail-address, but the account ist empty. History is not 5 years, but 5 minutes old. Getting desperate, all my passwords were there, all my accounts, everything….