In version 28 or so they removed the ability to configure Firefox Sync against a custom Sync server. You could continue to use an existing setup but there is no UI for setting up a new one. (all AFAIK)
It's things like this which become annoying. Almost like an old school corporate mentality... despite being an open-source platform. I'm trying to get into using Firefox again but the lack of transparency from Mozilla Inc. is frustrating.
