Firefox addons

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I am currently using two addons for Firefox 3.1. One is the Download helper that helps in downloading media files from most of the sites, it can also download videos from youtube and the other one is FoxLigo. I have just installed it and hoe that it will help me in translations jobs as a freelancer. I am waiting for much talked about addons for Firefox from Google. I think that they will add a lot of ease and goodness to internet browsing. Which addons are you using?