Falp said:
I started using this to replace all my open tabs (tree tabs) and near the bottom of the list noticed that suddenly everything I had watched disappeared. Only a few tags were left on the list.
There wouldn't happen to be a 'history' of sorts would there?

I've received another report with with this issue recently, so it's a pretty strange tendency. I can not know how browser stores the data provided by extension for long-term storage as it is browser's responsibility, but I can implement some kind of import/export feature soon so you can save backup data somewhere else. Kinda busy right now, but will surely make an update in a week or so.