Need to restore the feature of most visited sites shown upon opening a new tab

I have checked through my add-ons and can't find the solution. I've read answers that state go to the about: config. I can't find that either. I simply want my most visited sites upon opening a new tab feature restored. Help, please.

↓ Show more ↑ Show less
  • All posts
  • Helpful Solutions
  • solution
  • helpful
  • owner
  • post
  • post