Privacy

Xbrowsersync for bookmark syncing. Works across browsers. A real password Manager, like Bitwarden, for passwords.

For sending things to devices I use KDE Connect. I realize it is a fundamentally different application, but it is what I use generally to send / receive links between devices, as well as documents, images etc. It also is good for notification mirroring, and really just integrating Android devices into Windows / Linux computers.

For passwords I used KeePass (and I sync them between devices with SyncThing), but I usually recommend Bitwarden (which is what I used to use). Both are open source, have apps for all platforms, can integrate into your browser if you choose. The main advantage of Bitwarden is that it is open source, all necessary features are free, and you can host the server yourself if you want. It also integrates into some services, notably email aliasing ones, to allow you to generate new emails every time you make a new account.

For bookmarks / history your best bet is the extension everyone else is recommending here!

Come on and SLAM and welcome to the JAM

Oh sure, but browsers are an entirely different beast.

Eventually, they'll take it closed source, now I know what you're thinking "Then one of the forks will just become the dominant one!"

But here's the thing, the browser engine is very complicated just to keep up with. The W3C spec that all engines must follow is thousands of pages long. So all those forks will wither and die once the engine has been cut off from upstream updates.

None of those forks touch the engine as-is