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How do you change the icon on the about:newtab tab?

Firefox Settings
HeyMr.DJ
HeyMr.DJ

I want to change the icon for newtabs so it is different from preferences and mozilla.org pages. From what I have gathered this would need to be done with userChrome.css or userContent.css but I cannot find the relevant code.

I want to change the icon for newtabs so it is different from preferences and mozilla.org pages. From what I have gathered this would need to be done with userChrome.css or userContent.css but I cannot find the relevant code.
Attached screenshots