Developer reply by Connor Behan
Rated 5 out of 5 stars
Finally upgraded from TB3 to 17. Couldn't find a way to get my reply to be at top of post. Now it's done. Thanks.
This review is for a previous version of the add-on (1.0).I think what you found is a bug. That setting is supposed to be handled by Account Settings > Composition & Addressing.
To create your own collections, you must have a Mozilla Add-ons account.