speedrun.com for firefox per Matt Tomko

The speedrun.com firefox extension lets you keep track of all of your favorite categories in one place.

Features:
- Add any speedrun.com category to your home page, including sub-categories and individual level categories.
- See the world record time and user for all your followed categories at a glance.
- See notifications on your home page when a category has a new world record.
- Easily open a run on speedrun.com with one click.

That's about it, enjoy.

Kofi: https://ko-fi.com/matttomko