This is gonna be essential for me from now on. Thank you.

Edit: If I pick a big number for time allowed, it breaks down after a while. And that feature can't be disabled. I could compromise with a reminder after a while, but not for the tab to be completely killed. :(

It also becomes very slow when opening a container, though that's not a deal breaker.

Simple and effective! The UX (timer then voluntary unlock) is perfect. Thank you a lot.
Suggestion: It would be great if there was a way to avoid page unloading at the end of the timer. Like adding an hashtag at the end of the domain (ex. ft.com#)
Because sometimes the page unload in the middle of an interesting article, and... You you imagine what happens 😅

Thanks for making this extension! Seting a timer until you can view a page and for how long you can use it works great!