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if you are referring to this change, i don't think it is related to synching between browsers: "Sync autosaved sessions with all views in real-time"

Oh, thanks, my bad, I got it wrong. I also checked using two devices that it doesn't actually sync anything via Firefox Accounts.

By the way, Tab Session Manager [1] (another contender) can sync via Google Drive across different browsers (Firefox/Chrome).

Floccus and Tabli are also excellent choices