Stop buffering Youtube Video and save data

Youtube videos are everywhere over the net. Anybody can embed the videos to their sites. We can go to the site, click 'Play' and view the video. There are chances that after a few seconds of viewing you find that you did not like the video and click 'Stop'. This will stop playing video, but will continue to buffer the data in the background adding to your data charges.
The best practice is to RIGHT CLICK anywhere inside the video and choose 'Stop download'. This will immediately stop buffering the rest of the video.