Another Firefox Extension!! huh! Firefox does know how to make the job of its users easier and easier.This one is supposed to be the best extensions by firefox until now.
It basically allows you to play videos from your favorite video sites such as YouTube, DailyMotion, MetaCafe, MySpace right from within your Firefox sidebar.
In short, YouPlayer is a video player with playlist which works on Firefox sidebar while you are surfing the Internet on the right.
Users can make a playlist of videos and watch them while surfing the web. The reason I love this extension is because it kills the limitation of staying on a browser window to watch a video and allows you to enjoy it virtually anywhere you go.

How To Use YouPlayer

1. Firstly, install YouPlayer Firefox add-on. Upon installation, click on “YP” on the bottom right side in your Firefox browser.
2. To start to watch an online video, you can click on “Search” button in YouPlayer to search a video in YouTube, Google Video, Metacafe, DailyMotion or MySpace.
3. You may drag and drop a link or local files from hard drive into a playlist window. When you double-click of it, it will be loaded in the video window.
4. You can save the playlist and make it work as a bookmarker so you can always continue to watch the unfinished video in your playlist.