According to John Lilly, COO of Mozilla, the preemptive release of the eBay Toolbar even ruffled some feathers among the eBay execs in Europe."Besides basic search features, it removes external ads on the site and allows users to see thumbnail pictures on ALL search items, even those sellers didn't pay for. An eBay toolbar has been long overdue. Users have petitioned for one on eBay discussion boards since October of 2005. Succumbing to popular demand, the eBay Developer's Program put a Firefox toolbar in the pipeline, but it seems that the Stanford students beat them to the punch. eBay can't be too enthusiastic about this toolbar since it cuts directly into its main sources of revenue: ads and thumbnail fees. But eBay users get a really good deal.
Slashdot videos: Now with more Slashdot!
Anyway, this probably isn't any worse than regular Internet use, where every router from you to the recipient can read the content of the traffic. It might be worse if you expect the Tor routers to be less trustworthy than the random Internet routers your traffic gets routed thrtough. I am of the opinion that it's probably better, since with Tor at least they don't know who the sender and recipient are. This may be more damaging information for some applications (indulging your tentacle porn fetish) than for others (webmail login).