Developer reply by Oleksandr
Rated 5 out of 5 stars
This looks like a great addon but it conflicks with this addon
https://addons.mozilla.org/en-US/firefox/addon/file-and-folder-shortcuts/
it disables the ability to launch items from it's Shortcuts menu
thank you for your report!
To create your own collections, you must have a Mozilla Add-ons account.