Good add-on! just one thing missing... Rated 4 out of 5 stars
Does everything as advertised :) Easy help if you, for whatever reason, have lost your favicons in your bookmarks.
Giving this 4 instead of 5 stars because one rather important thing is missing: the AppMenu (Firefox button) has a bookmarks menu entry, but the add-on's "reload favorite icons" is painfully missing from there.
Dev: you probably need to add an extra entry to the overlay to fix this, and remove it from the context menu (which is an odd place to put it). Most people are not using the classic menu bar these days but are using the Firefox button and its double-paned AppMenu. insert it somewhere in appmenu_bookmarksPopup :)
Okay, I will have to look to this overlay path.
The Context Menu entry is added because of user requests. I have tried to give an option for this but the bookmark context menu is no easily customizable as other overlay points. A few month ago it was removed from the mozilla documentation.