This is the current DevTools color picker. And this seems like the code: https://searchfox.org/mozilla-central/source/devtools/client/shared/widgets/Spectrum.js
Bug 1445061 Comment 4 Edit History
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This is the current DevTools color picker. And this seems like the code: https://searchfox.org/mozilla-central/rev/1749ba14c2ebe200855802c478780122135727f2/devtools/client/shared/widgets/Spectrum.js