this post was submitted on 06 May 2025
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if you trust mozilla, firefox sync handles most of that - bookmarks, history, passwords, extensions and some of their settings, etc; cookies and localstorage aren't copied over, for e.g. logged-in sites and such.
Sync is mostly for bookmarks, history related stuff, and a few sparse settings. But it doesn't sync a ton of stuff like customization, addon settings, and so on.
Eh, I've had lukewarm luck that Firefox sync works for it over the years I flip flop around browsers and installs.
I'd rather do it right the first time than flipping a coin that it works this time.