How can I sync my Firefox browser? It always asks for my Primary Password. I tried resetting my password, deleting/recreating my account, and I'm always asked for the "Primary Password". I can log into Firefox Accounts with my e-mail and known password, but I can't reach the sync option because I'm always asked for the "Primary Password", which seems to be out of sync with my Firefox Account.
Are you using the Primary Password in Firefox?
I ask because Firefox wants to store the credentials for the Firefox Sync Account in the Password Manager to be able to reconnect when you start Firefox. If you use the PP then you need to unlock the logins to make it possible to store these credentials. This also means that you get the PP prompt each time you start Firefox.
Note that this entry is hidden from about:logins and you will only see it in logins.json in the Firefox profile folder.