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Mozilla is testing new tab wallpapers in desktop Nightly
(i.imgur.com)
about:config --> browser.newtabpage.activity-stream.newtabWallpapers.enabled true
They really should add the option to set custom one, especially on Android all of the currently available ones look so bad.
This is about time I get to utter my favorite taco commercial quote:
Why not have both?
I'm just glad they've kept all twelve themes. "Classic Firefox" is older than "Artist Voices," and the latter was discontinued a while ago on the desktop.