Inline context without losing your place in the article

I was reading about the Dreyfus affair and hit "syndicalism" — a word I'd skimmed past a dozen times. I knew the shape of it, not the substance. Opening a new tab meant losing the paragraph I was in, reorienting, reading something adjacent, and coming back with my thread broken. rabbitholes is a Chrome extension that solves the specific version of this problem: you want the context, but you don't want to leave. Highlight any text and a shadow-DOM tooltip renders an explanation next to your curso