I've dusted off my own extension from 2011 and brought it back. The new version sports a cleaner look and works with current versions of Opera. I abandoned the old extension when Opera made the switch to Blink/Chromium. Admittedly, I too had switched browsers during that period.
Opera has seen significant improvements since, packing great performance with a pleasant Mac UI. Surprisingly, a hacker news speed dial extension was still missing from the add-ons gallery.
So here goes.