It's funny how every now and then an extension like this comes up on HN. Nice execution, I like your homepage too.
I wrote a comparable extension with a similar vision about 5 years ago (with Clojurescript): https://jazzytomato.com/hnlookup-chrome-extension-clojurescr...
I have actually seen your extension when I was trying to figure out how to get started with making one in cljs. I've used shadow-cljs though instead of figwheel.