I-Firefox Isithangami Sokwesekwa

I mistakenly removed the passwords on a divice, before suspending the synchronization (!!) of a device: now my other 3 devices have a "passwords delete" pending...; How can I prevent other devices that are not yet in sync, to erase their passwords?

I just logged on and went to Netflix. I was logged in under an account I haven't used in a year. While trouble shooting the issue I discovered the browser updated and synced my old account with my new one. This included passwords and logins that were compromised in data breaches. I don't even use the old computer or any of those passwords. Now I can't even get Netflix to play on there with the correct login data. I took that old account info out and deleted the cookies from compromised accounts. Can anyone tell me how to fix the sites, other than switching away from Firefox entirely?

I am not happy and can't even leave feedback to get real support from the people who did this dumb stunt without even asking me first.