Easily find Hacker News threads about the page you're currently browsing.
Dead-simple yet very useful extension that looks for threads on on popular social news aggregator Hacker News via HN Search API (powered by Algolia). For your privacy, this web extension fetches the API only when the popup is clicked and does not run any background script. It also requires minimum permissions (just "activeTab" actually).
Source is on GitHub: https://github.com/pinoceniccola/what-hn-says-webext