Save typing hundreds of letters per day, and replace about:newtab with news.ycombinator.com, now you can just do CTRL+T :)
at that moment my productivity would drop to zero
mine already has and I dont even have hackernews as my new tab :)
On all fairness though, mine is same for the original comment where just pressing n autocompletes it to https://news.ycombinator.com/
I had the same thing for Slashdot.org for many, many years. Both the reflex and the browser autocomplete. I still miss the old /. It was like HN + Hackaday + Usenet.
digg too, till they ruined it...still can't believe they ruined digg.