Just updated! This is simply a brilliant addon for anyone who spends most of the time on the keyboard or on a laptop, maybe travelling. It just takes an instant to open a search result or navigate pages using this addon, which frees you from having to use that slow trackpad, or having to reach for the mouse.
I've used this for about 10 years now. Review edit: I helped port this to WebExtensions initially as "Add Search Number", and this has since been landed to Search Keys. Thus, this should work in Firefox 57+!
Unfortunately, not all of the keys work anymore. The period used to go to the next page of results and the comma used to go the previous page of results within google. Love this add-on and have been using it for a long time. Any updates or alternatives?