Eliminate the large, wasteful black margin around the Netflix Silverlight player.
Install it at userscripts.org. Firefox users will need to install GreaseMonkey.
GreaseMonkey Script: Larger Netflix Silverlight Player
GreaseMonkey
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The best method to download YouTube videos
I like to download lectures and presentations from YouTube so that I can play them back using VLC at 2x playback speed.
My favorite option for downloading is this YouTube video download GreaseMonkey script that adds a download button to the YouTube video page. It works in Chrome, and in Firefox with GreaseMonkey. This is vastly superior to the more-popular YouTube video save sites that require to you execute a sketchy Java applet.