Developer reply by Oleksandr
Rated 5 out of 5 stars
A little function for adding custom icons to the menu items would help a lot but still a great add-on!!
Thank you very much for programming this one Sir.
for modify existing icons please use settings Style by the rules CSS, example:
list-style-image: url('http://......');
list-style-image: url('file://......');
list-style-image: url('data:image/png;base64, ...');
for modify and create new icons, please use another add-ons, such as "Menu Icon Plus"
To create your own collections, you must have a Mozilla Add-ons account.