One Aspect Missing Not yet rated
Works as described, however, this plugin apparently does not consider the time to be interrupted when the user is working on the page.
I hoped that (and would have preferred that) the plugin stopped counting when any activity was detected on the page. I do not want to be in the middle of updating a file, for example, and have it suddenly refresh on me.
So ideally, the default clock would have started ticking again when FireFox detected any useer activity on