I have Managed to edit the Firefox icons on the Browsers Main page and New Tab areas to use the Firefox Icons from 2004 using .css files, as they are much more aesthetically pleasing too me. Given this is a feature many people have tried replicating besides just me, i think it would be a great idea to be able to customize which ones to use in settings, since coding it yourself is something the average user probably couldnt do and i only achieved with the help of an AI assistant. It would allow users to chose between the Minimalist or Detailed logo's of the past without forcing one on them, though the Minimalist could remain the default.