Add feature to modify & customize the icons of the bookmarks

I’d like to be able to modify and/or customize the appearance of multiple standard icons (mostly the ones showing in your bookmarks bar that have no icon from the origin website)

Folders, because they look all the same : would be nice being able to change at least the color and/or use a custom icon (which would be ideal ^^) - (yellow coloured arrow)
Globes, bookmars with no website-own icon sadly all have that boring globe! - (salmon coloured arrow)
Website specific, the “crème de la crème” would of course being able to even modify the icons of bookmarks which have already a given icon from that website - baby blue coloured arrow)