Thank you very much for creating an addon like this. Initially, I started creating a list of sites to be blocked, then went fully nuclear and simply put an asterisk (*), which blocked everything (using the same scenario for all browsers in the computer and of course, using it in the phone too). If something does need to be checked out, I will use the override option (very cautiously and will limit the time to say, 10 minutes or so). Pity there are no separate lock down and over ride buttons.