Rated 5 out of 5 stars
Since Flash Video Downloader removed the YT download function recently, I searched for a better solution, and found 1Click. Very happy with it's YT performance. Would've switched sooner had I known.
I agree about what mizzmona said, below. There are a LOT of popular add-ons that automatically open tabs to their websites once updated (Firebug, FlashGot, NoScript, etc.). Never bothered me. It's just *once* after each update, for crying out loud.