I’m happy that syncing works for you but privacy is very important to me so I don’t want to upload my data to someone else’s server(s).
I’m going to experiment with uninstalling flatpak firefox completely and reinstalling it to see if it’ll fix the issue.
If that doesn’t work, I’ll try using firefox downloaded & installed with apt.
Tell me about it, it took me a long time to get out of google’s ecosystem. As cliche as it sounds, you have to do it one step at a time