Basically I am using mull on android and librewolf on linux.I want to use firefox sync or something line that for syncing.So how good Firefox sync is, in privacy point on view. I am not anonymity paranoid I just want privacy so basically what do they collect and for what?
As far as i know it's barely possible to really host it yourself. I don't know the details anymore but i looked into it half a year ago and quickly gave up. Think it was severely outdated and depedency issues, not sure anymore.
I set it up using a docker image based on the older Firefox sync repo. It's outdated but it works. What I don't self host is authentication as it is way more involved than I prefer my self hosting projects to be and I'd probably end up frustrated by some little thing not working.