TL;DR: I wrote a small Chrome extension that focuses the search field on any site when you press /
GitHub, Reddit, npm, and MDN all let you press / to jump straight to their search box, and after enough years of that it stops being a shortcut and turns into a reflex. The problem is that the most sites don’t support it, so I’ll often type it only to be disappointed, and end up having to use the mouse.
So I wrote a Chrome extension called Slash to Search, which makes / work on any site. Just press it when you’re not already typing in an input field and it’ll finds the page’s search box and focus it.
I haven’t bothered to put it in the Chrome Web Store, but you can install it manually. It’s under 200 lines, with no permissions or dependencies.