Firefox (Mozilla) like Safari is serving a multi-platform audience where users are switching continually from their computer, to their smart phone, or to their tablet and back several times every day. So they are taking a cue from Apple's playbook to make that transition as invisible as possible. So just as Apple uses iCloud to link all the data, Mozilla is using their own cloud server (account) to provide the interconnectivity between devices and locations.
If you are not a multi-platform users I can understand your not liking the change, but assuming that is the case, you are part of an ever smaller minority of users. In fact there are a millions more users that do NOT have a computer than those that do. It occurs to me there is also the potential for Mozilla to mine data from that database for sale, so future users might continue to use Firefox at no cost. I am not saying they are data mining, but the option is there — if or when it is ever needed.
"The times they are a changing"
