Developer reply by Infocatcher
Rated 4 out of 5 stars
I use it extensively.
Unfortunately it does not work with the new version of Firefox 48.0.
Please update it soon.
Ich verwende es sehr gern.
Leider funktioniert es mit der neuen Firefox-Version 48.0 nicht mehr.
Bitte aktualisieren Sie es bald.
Will be fixed in upcoming release:
https://addons.mozilla.org/addon/addons-quick-search/versions/0.1.3
Sorry for inconvenience.
To create your own collections, you must have a Mozilla Add-ons account.