1.If use firefox, we should use Facebook video plugin (https: / / addons.mozilla.org/en-US/firefox/addon/9614) to get video from facebook.This add-on to add new options in the video page, wall, and Interestingly inbox.the interesting thing is these new elements as if united and appear as part of the facebook.with this add-on you can download the video, convert to different video formats (get it) and put the video to the another sites outside facebook.

2. This tool is as good as the add-on at the top, especially the capability and functionality.you can use GreaseMonkey script in the browser Firefox, Google Chrome, Opera, and Internet explorer.of course that the script can be used in firefox must first install the GreaseMonkey add-on  (https: / / addons.mozilla.org/en-US/firefox/addon/748) in firefox

3.What if we do not want to use add-on Firefox or unwilling to download videos directly from facebook? Solution is to use KeepTube (http://keep-tube.com). You only need to copy the video page URL, then enter the URL box in KeepTube , then click Download!. After the link will display the URL of the video files can be downloaded