It's probably not broken but just works that way. Profiles are separate in more ways. Syncing all profiles could be counterproductive and unwanted. (for example, profiles which might just belong to different people - though it may be unlikely on a same pc but nonetheless. or syncing profiles that are intentionally kept separate, like work and personal stuff). It's not how it worked before in firefox, and it's not how it works on chrome or other browsers, and it's probably not in users expectations, when they expect separate things to be actually separate. (which seems to utterly confuse people who mix up container tabs and profiles functionality.) Conversely, why should someone remember, or rather, suddenly find out, that every profile in some firefox install is syncing to a same account, even though it is "intended" to be a separate, brand new, start from scratch kinda thing?