Keep track of where your browser has been and for how long with the Firefox extension pageaddict which can be downloaded here. I’ve been checking this out for a couple days. It sort of reminds me of the Mac program Active Timer, but since it only encompasses how much time is spent at domains, it won’t be terribly useful for webmasters trying to divide up their work within individual websites. Also, if you look at the screenshot above you’ll see most of the time is spent at this website and my personal site which is wrong because I leave the post publishing window open and my personal site hosts the RSS reader I currently use (reBlog). If you forget to minimize the windows, it can also hose the numbers.

Some potential here, especially if better historical stats are provided.