Here's a bookmarklet I use to launch a quick search for a page I'm looking at.

    javascript:(function()%7Bwindow.open('https%3A%2F%2Fhn.algolia.com%2F%3Fquery%3D' %2B (window.location.hostname %2B window.location.pathname %2B window.location.hash).split('%2F').join(' ').split('%23').join(' ')%2C '_blank')%7D)()

It could do that - I built it to satisfy my own use case, which was that I wanted to see the HN comments side-by-side with the content while I was browsing.