Facebook allows you to stream that video but there is no download option provided .So lets explore some of the best websites for downloading Fb videos with required quality.
1.KeepVid: This website allows you to download Facebook video with a single click. You need to copy the Video Url from the address bar of your browser and paste it and download link will appear , Right Click and Save your Video.Also this website allows you to download Popular,recently added and shared videos on Facebook.
2.Down Facebook: This is a website similar to above, you need to Paste the Video Url and grab the Download link and save it your computer.Alternatively you can download a Video directly by:
3.Down Vids: This is also a very easy process of downloading videos in the required quality and size.Paste the URL. Right Click & save as then your video will be downloaded