Video DownloadHelper - Browser extension to download videos from the Web
Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
Flash Video Downloader - Flash Video Downloader is a popular extension for Google Chrome browser for downloading wide range of files over the internet.
Turn Off the Lights - With a single click on the lamp button, the page will fade to dark.
ClipGrab - A friendly downloader for YouTube and other sites
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.