Net Usage Item is a TOP Firefox add-on Rated 5 out of 5 stars
I agree totally with all the other very positive reviews. Net Usage Item is an excellent Mozilla Firefox add-on, doing all that you need in an attractive and elegant way.
I've been using it for several years, and it's one of the first add-ons that I install whenever I do a fresh install of Firefox.
It breaks occasionally, typically not Critter's fault but when an ISP changes something that causes a parsing error, as seems to have happened with Optusnet Cable in the last day or so. It was working unobtrusivey for months. then a day or two ago suddenly started giving "S6" parsing errors (with latest add-on version 1.2.331), so I sent off the debug text file to Critter and hope he will adjust the parser soon.