I made a web extension like this a while back. Called Prod, it’s a similar idea but in the browser. Feel free to use it it’s free and there are no plans to change it. Been around for years.
I built a todo list extension that blocks addictive websites until you finish your tasks. Importantly it redirects you back to your todo list and shows you a pair of disappointed eyes.
I believe it really helped me deal with procrastination, but of course the whole project was just a way to procrastinate.
I planned to make it a business, but many of its features are now built into OS. And Google doesn’t like it.
You can still get it for brave and Google chrome, but I’m no longer working on it. In case it you need it. The Firefox version is not good.
prodtodolist.com if you’re interested