Fluxboard by Manish Aravindh

Fluxboard is a minimal and fast new tab replacement extension for Firefox. It offers a clean interface with bookmarks, todos, notes, and a customizable clock. No clutter, no ads, no nonsense — just a simple, user-friendly productivity dashboard that just works.

Check it out on GitHub if you have any problems with the installation: https://github.com/manisharavindh/Fluxboard