Very handy but unfortunately it didn't fix my wrong favicons. Maybe if you add option to delete the firefox file that stores the favicons and let firefox create a new one - it would work perfect
Hi, the webextensions api doesn’t support the direct manipulation of favicons. You can delete favicons.sqlite in your profile folder and run the extension again. The location depends on your operating system: http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder
