Needs to refresh the page after the pause timer is up for this to work properly. Either that or have some notification popup instead.
EDIT: the pause timer sometimes crashes the browser. I don't know exactly what happened but basically I clicked pause, restarted the website I paused, but then when I opened the Impulse Blocker panel back up, it didn't save the timer, meaning I could pause a second time while the website I was on was still up. I think the crash happened after I refreshed the page of the website I blocked.