Source? Are you perhaps thinking of the currently unused "class-A data"? https://blog.mozilla.org/services/2014/04/30/firefox-syncs-new-security-model/ https:

Source? Are you perhaps thinking of the currently unused "class-A data"? https://blog.mozilla.org/services/2014/04/30/firefox-syncs-new-security-model/ https://blog.mozilla.org/services/2014/04/30/firefox-syncs-n... https://blog.mozilla.org/services/2014/02/07/a-better-firefox-sync/ https://blog.mozilla.org/services/2014/02/07/a-better-firefo... https://github.com/mozilla/fxa-auth-server/wiki/onepw-protocol https://github.com/mozilla/fxa-auth-server/wiki/onepw-protoc... Edit: From what I can see, client side encryption in Google Chrome appears to be opt-in?