For many years I've been using cutebuttons in my userchrome.css file that I got from ChoGGi at github. https://github.com/ChoGGi/CuteButtons.
Since Firefox 68, the css doesn't work. While I've tried playing around with it, I've managed to get some icons to appear but nothing in either the context menu or on any of the menu items from the menubar. Is this even possible anymore? The space on the left side is still there but I can't for the life of me figure out how to do it. An example would be Tools > Downloads. There would be an icon next to Downloads on the left.
Any help is greatly appreciated.