For your Information Rated 2 out of 5 stars

The icon problem may not be because of the add-on.

Please do not comment in bug reports.
Bug 1155413 - Many icons missing from Add-on Customize Manager
https://bugzilla.mozilla.org/show_bug.cgi?id=1155413

Rated 3 out of 5 stars

I confirm it could be nice if the icon does not have a malfunction... It does not appear...

Rated 3 out of 5 stars

Good.. but Icon Error