Facebook

Download Videos

 * 1) Right-click on the video, then select the third option Show video URL
 * 2) Copy the video URL from the little box.
 * 3) Change web or www to mbasic as shown below then press Enter on your keyboard to redirect it to the basic mobile version of Facebook.
 * 4) Right click on video and click "Save As"

Ref: https://www.tutovids.net/how-to-download-facebook-videos-without-any-software/