I don't mind that Firefox saves my history so I can more easily find a website I've previously been to. I don't mind that it gives me a front page of my most visited sites so I can just click the one I want to go to on the new tab page. I don't mind that it syncs open tabs across devices so I can more easily move from working on my phone to working on my laptop.
(I do wish that it would do so locally across LAN, though, rather than use Mozilla servers as a middleman. You can self-host Firefox Sync if you want to, though.)
For adaptive technology that anticipates our needs to function, it needs to possess information about us. A password manager can't auto-fill your passwords unless it knows them.
I don't mind these things, because they run locally on hardware that I own, and I am in full control of this data and how it is used.
When people control the technology, there is no trade-off between privacy and convenience. These problems only arise when data collection technology is created to serve the interests of capitalists who want to exploit you, or governments who want to brutalize you.
The problem, as always, is Capitalism, baybee.
