It's only fair to say that Chrome also offers this feature. You can set optional (mandatory for passwords) sync passphrase so your sync data is encrypted. In f

It's only fair to say that Chrome also offers this feature. You can set optional (mandatory for passwords) sync passphrase so your sync data is encrypted. In fact I liked way Firefox Sync did this same way (when it was called Weave) -- actually allowing to use a passphrase. They got rid of passphrase and they are now using username/password pair to handle encryption.