Source of the scan: archive.org
I can’t make a Yoda theme for the Firefox browser, because Yoda is not my IP. I am using a design by Henry Holiday instead. It was published as an illustration to The Hunting of the Snark in 1876, so Holiday didn’t copy it from Star Wars.
Left image (2016): Concept art by Prince Mahlangu, Johannesburg, South Africa.
Right image (1876): Illustration by Henry Holiday (engraved by Joseph Swain) to Lewis Carroll’s The Hunting of the Snark.
2017-08-28, updated: 2020-12-19
PS: I have to admit that at work I use my “Ergodark” theme instead of any of my Snark themes.