I did a quick release of Spider last night to support loading it in Thunderbird. No other changes were made.
Unfortunately, the update mechanism didn’t work so I will need to figure that out and post a new version. If you know what I did wrong, I would appreciate hearing from you.
I am seeing strange behavior when loading Spider into Thunderbird’s preview pane where Spider automatically reloads itself many times very quickly, so there will be an update soon which will hopefully fix the issue.