Any thoughts on this / ideas for expansion would be awesome
1) The icon needs some work. Not sure what you're trying to represent.
2) When you click enable/disable in the popup menu, the menu should automatically disappear. You shouldn't have to click again to dismiss it.
3) If while you have the extension disabled you load a page in your blocked list, then enable the extension, then refresh the page, the page doesn't get blocked.
The refresh thing has to do with the way chrome handles this event. I'm working on a work around for it right now.