If you are on a slow internet connection, YouTube is difficult to use. You don’t know when the playing starts and when buffering starts. To avoid all these difficulties we have an extension called SmartVideo for YouTube.
SmartVideo for YouTube gives you control over YouTube video buffering. You can set the extension when to buffer and when to play the video. With this extension you can make YouTube a lot more easy to use. This extension is available for both Firefox and Chrome browsers.