I don’t remember ever seeing this usage pattern in the wild? As far as I understand, it would always have resulted in data loss whenever users chose to clear br

I don’t remember ever seeing this usage pattern in the wild? As far as I understand, it would always have resulted in data loss whenever users chose to clear browsing data. There also wouldn’t have been any natural way for backups or synchronization. A browser plugin might be one way to achieve something like this. Personally, I really don’t care about the data my feed reader has, so I wouldn’t mind even public data storage backends, like gist. Or steganographically encoding my list of feeds and uploading it to porn sites :)