Hi! Thank you for using my addon and for the ideas! I am not sure about css customization as it does not fully correspond with the idea of the addon to look as native as possible, but I have already been considering some use of favicons in any of the future versions. + I like the idea of an ungrouped list and I will add it to my issues/ideas list. You can use search if you want to look for a particular tab(s) without grouping, but it currently cannot show you the whole list. Have a nice day & a happy new year!