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?
I started using Librewolf a few days ago and they recommend xBroswerSync in their very short list of recommended addons. This has been working fine for me although sometimes all my bookmarks disappear but that soon sorts itself out after a sync.
Recommended addons page: https://librewolf.net/docs/addons/
Not available for android. Do you use custom addon collection.