Enhancer for YouTube - Tons of features to improve your user experience on YouTube™!
Workona - A better way to work in the browser.
ImprovedTube - Allows you to improve and enhance Youtube visually or enable dozens of new features permanently or...
OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.
Magic Actions for YouTube - Magic Actions is an extension that changes the way you’ll watch videos on YouTube.
Session Buddy - Manage Your Browser Sessions