Rated 5 out of 5 stars

Since for me the new standard icons look sulky I installed "Phoenity Icons" and I'm very happy with them :). Currently (2019-11-16 v2.5) the extra mail and lightning windows don't show the Phoenity Icons, but Dillinger promised to fix this in near future (if possible).

This review is for a previous version of the add-on (2.5).