Background: I've recently (few weeks ago) changed my email address for my firefox account. The original address became a secondary address. Then i deleted the secondary (old address). So i was left with only 1 primary address. Now to the problem - today ive done a fresh windows install and i wanted to recover all my settings and tabs from my synced account. Ive logged in to my mozilla account using the new primary email (as for the old email when i try to log in it says i need to use primary email, so it should be still connected i think, but i can't use it to log in). Now after i logged in (using my new primary email) all my stuff was gone, as if it was a new firefox account. No old device connected, nothing. Ive literally checked my firefox acc today morning (and synced!!) to make sure everything's good and now theres nothing. I still have access to my old email if it helps, nothing bad happened there but i don't know if that helps.