I use AdBlock Plus to rid of those ad on sites and make the page load faster.
Other than that, I have DownThemAll, Fast Video Downloader, GSpace (I don't even use this one...), IE Tab (have to remove now, no use), Flashgot, Magaupload SX.
About the translator, it is not a tool for translate correctly, only a tool help us to understand what is before does not make sense to you.