I bring up web page: https://www.facebook.com/video.php?v=10152432831365653&set=vb.618775652&type=2&theater
This web page has a 'window' for playing a video clip. Using Firefox menu entry Tools->Page Info->Media, I see that the only entry for a .swf (or other video file) is: https://fbstatic-a.akamaihd.net/rsrc.php/v1/y1/r/wp3fsUyK7CP.swf with it shown as Embedded. Interestingly, this URL changes if I close Firefox & start again.
When I download this file (using the Save button) and open it, it just displays a blank page. This happens with any of VLC, Adobe Projector 16 or LightSpark. I've also tried the Firefox addon of Download Helper, but that didn't 'see' the video clip.
So my guess is that the .swf entry somehow refers to the real video file. How can I download the actual video clip as a file?