Rated 3 out of 5 stars
could not work properly on multi-tab.
also, the total download size often differs with opera status bar.
it seems the images loaded on some site are not counted as well though i have already cleaned the cache. for instance image loaded from gmail message not counted as total downloaded size.
hope this addon will improve in the future, or will be included in future firefox version. :)
keep up the good work!