Studova Focus Blocker (For Studova.me) by Studova

Studova is a free study app with a focus timer, daily streaks and private study groups where you can see your friends studying live. This add-on is its site blocker: while your Studova timer is running, the sites on your block list won't open.

You sit down to study, and ten minutes later you're somehow on YouTube. This fixes that.

How it works:
- Start a focus session at https://studova.me
- The sites that usually eat your time stop opening: YouTube, Instagram, Reddit, TikTok, whatever your weakness is.
- Try to sneak onto one mid-session and you get a quiet block screen instead, with a line to pull you back to what you were doing.
- Pause or stop the timer and everything unlocks. It even takes you back to the page you were trying to reach.

You pick your list once and forget about it. It's the accountability of "I can't check it even if I want to", which turns out to be the thing that actually works.

What you need: a free Studova account and a Studova tab open in Firefox.

Privacy: the add-on only checks the sites you visit against your block list while a session is running. Studova's privacy policy is at https://studova.me/privacy