Developer reply by Lorenz Froihofer
Rated 5 out of 5 stars
Where do I find the download for the xpi of opto's newest version?
This review is for a previous version of the add-on (2.3.1).Unfortunately, it has not yet made it through the review process, but the link seems already to be working: https://addons.thunderbird.net/thunderbird/downloads/file/1017761/xnote-3.0.0-tb.xpi
To create your own collections, you must have a Mozilla Add-ons account.