Securing your data with Sync involves creating a unique password, which plays a crucial role in encrypting your data for complete privacy. This encryption is end-to-end: your data is encrypted before it ever leaves your browser and can only be decrypted by another instance of Firefox. Once your data reaches a Mozilla-operated server for storage, it's already in an encrypted state, ensuring that not even Mozilla can access or decrypt this information.
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Just checked LibreWolf a hardened Firefox as I thought they disable it. Turns out its just off default and "There aren't significant downsides as Firefox Sync encrypts your data locally before transmitting it to the server."
I thought there might be another reason to have it off (giving Mozilla your email?) but seems OK.
https://librewolf.net/docs/faq/#can-i-use-firefox-sync-with-librewolf-is-it-safe-to-do-so
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From their websiteAll your data is encrypted on our servers so we can't read it – only you can access it. We don't sell your info to advertisers because that would go against our data privacy promise.
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It is e2e encrypted and just works. Everything in Firefox Sync is encrypted including Bookmarks, History, Passwords etc.
I love that feature tbh. Glad I can trust it. I use waterfox tho
I would say the feature is quite easily avoidable, as it only seems to require one manual visit, for it to show in the suggestions; which I believe are sorted based on interactions with pages (so just interact more with pages, you want to be suggested more strongly). I would personally advise against using the feature, primarily because it ties all browsers, on multiple separate devices, to a common Mozilla account. So why broaden your attack surface, for advantages easily reproduced manually? Is the little bit of added convenience, worth the (potential) trade-off?
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