Browser Statistics Firefox Add-on
I just added the Browser Statistics add-on to my Firefox browser. On the bottom left corner, it shows the number of kilobytes downloaded for the current page, total number of kilobytes downloaded since the last start of the browser, and number of pages loaded. I'm going to try to log these numbers each day and try to make use of the data (uh, if laziness doesn't get the best of me). If only there were some automated data logging.