I use Firefox (LibreWolf with Mozilla sync) on multiple devices. To have my tabs, extensions and history easy available I use Mozilla for syncing that data.
Would it be possible to just use a generic sync service like rsync or something, to sync the profile folders and every file in it?
Or would that break or corrupt data?
Keep in mind though that with Firefox Sync, all your data is encrypted, whereas a generic sync of your profile folder will have all that data on your sync server without encryption.
Fair point, so I need to trust this server or control it myself etc.