Im not surprised, here is WOTs page for that site
http://www.mywot.com/en/scorecard/zoom-bro...vista-files.org Each entry has own page where you can write/read comments. Open door for spam but sometimes you also run into people who have done actual test of fake registry booster

Take few seconds to find malware domains with fake AVs etc. which Norton, Mcafee have no clue about - and are blocked by WOT. 50% of such a service is database, 50% is plugin and you can customize it - so I see 100% reason to prefer WOT.
Just dont be a slave of yellow or half red lamps. Full red should of course be checked really well if even visited. You must have good reason to visit such a site. Yellow can be debated, will not cause harm directly but product might be crap, bad business ethics or whatever.
Dont really know much about TB but I would guess Bitdefender have placed extension in profile folder?
http://kb.mozillazine.org/Uninstalling_add-ons If you disable it should be ok. But then lets hope Bitdefender is neutralized!