This is Make America Kittens Again:
https://github.com/tomroyal/Make-America-Kittens-Again
https://chrome.google.com/webstore/detail/make-america-kittens-agai/klchnmggepghlcolikgaekpibclpmgcm
.. that replaces images of Donald Trump with kittens, reworked a bit to support Firefox Quantum. It's currently missing a few bells and whistles but mostly works.
@tomroyal tomroyal.com